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Aliens Group Recruitment Process, Interview Questions & Answers

Aliens Group conducts a multi-phase interview process starting with aptitude tests, then technical interviews emphasizing software development and coding challenges. Final rounds focus on project experience and problem-solving approach within IT domains.
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About Aliens Group

Company Description

Aliens Group is a prominent real estate developer based in Hyderabad, India, established in 2004 by visionary brothers Hari Challa and Venkat Challa. The company is renowned for its innovative and futuristic designs, aiming to redefine urban living through technology and sustainability. Aliens Group's flagship project, Aliens Space Station, is a testament to their commitment to excellence, featuring state-of-the-art amenities and eco-friendly features.

Work Culture & Job Environment

Aliens Group fosters a dynamic and inclusive work culture that emphasizes collaboration, innovation, and professional growth. The company values its employees and provides a supportive environment where individuals are encouraged to take initiative and contribute to the organization's success. Employees appreciate the strong growth culture, timely salaries, and a good incentive structure. The company promotes cross-departmental learning and offers opportunities for career advancement.

[Job Role 1: Civil Engineer]

Skills (for reference):

Proficiency in structural design and analysis

Knowledge of construction materials and methods

Familiarity with building codes and regulations

Strong problem-solving abilities

Effective communication and teamwork skills

Previous Roles (for reference):

Junior Civil Engineer

Site Engineer

Structural Design Engineer

Q1: Can you describe a challenging project you worked on and how you overcame obstacles?

In a recent project, we faced unexpected soil instability. I collaborated with geotechnical experts to redesign the foundation, ensuring safety and compliance with regulations.

Q2: How do you ensure the quality and safety of construction materials?

I implement rigorous testing procedures, adhere to industry standards, and maintain detailed records to ensure all materials meet the required specifications.

Q3: How do you manage project timelines and budgets?

I develop detailed project plans, monitor progress regularly, and make adjustments as needed to stay on schedule and within budget.

Q4: How do you handle conflicts on the construction site?

I address issues promptly through open communication, mediation, and by implementing solutions that prioritize the project's success.

Q5: Can you explain your experience with construction software?

I am proficient in using software like AutoCAD, Revit, and Primavera for design, modeling, and project management tasks.

[Job Role 2: Sales Manager]

Skills (for reference):

Strong negotiation and closing skills

In-depth knowledge of real estate market trends

Excellent communication and interpersonal skills

Ability to develop and implement sales strategies

Leadership and team management abilities

Previous Roles (for reference):

Sales Executive

Business Development Manager

Real Estate Consultant

Q1: How do you identify and target potential clients?

I conduct market research, analyze customer demographics, and utilize networking to identify and approach potential clients effectively.

Q2: Can you describe a successful sales strategy you've implemented?

I developed a referral program that incentivized existing clients to refer new customers, resulting in a 30% increase in sales over six months.

Q3: How do you handle objections from potential clients?

I listen actively to understand their concerns, provide clear and honest information, and offer solutions that align with their needs.

Q4: How do you stay updated on market trends?

I regularly read industry publications, attend webinars, and participate in networking events to stay informed about market developments.

Q5: How do you motivate your sales team?

I set clear goals, provide regular feedback, and recognize achievements to keep the team motivated and focused on their targets.

[Job Role 3: Marketing Executive]

Skills (for reference):

Expertise in digital marketing and social media strategies

Strong content creation and copywriting abilities

Analytical skills to assess marketing campaign performance

Knowledge of SEO and SEM techniques

Creativity and attention to detail

Previous Roles (for reference):

Marketing Assistant

Content Strategist

Social Media Manager

Q1: How do you develop a marketing strategy for a new project?

I conduct market research, define target audiences, and create a multi-channel marketing plan that includes digital, print, and event-based tactics.

Q2: Can you provide an example of a successful campaign you've executed?

I launched a social media campaign showcasing virtual tours of our properties, which increased online inquiries by 40%.

Q3: How do you measure the effectiveness of a marketing campaign?

I use analytics tools to track key performance indicators like website traffic, lead generation, and conversion rates to assess campaign success.

Q4: How do you stay creative in your marketing efforts?

I stay inspired by exploring industry trends, collaborating with creative teams, and continuously testing new ideas to engage our audience.

Q5: How do you manage multiple marketing projects simultaneously?

I prioritize tasks based on deadlines and impact, use project management tools to stay organized, and delegate responsibilities when necessary.

Aliens Group Interview Guide

Company Background and Industry Position

Aliens Group has carved out a distinctive niche in the competitive world of real estate development and infrastructure, especially in India’s rapidly urbanizing markets. While not a household name globally, within its sector it’s known for ambitious projects and a youthful, energetic approach to growth. Their portfolio ranges from residential complexes to commercial hubs, emphasizing innovation and quality.

This backdrop shapes their hiring mindset. They look for candidates who not only bring technical skills but also fit a culture that thrives on adaptability and a certain hunger to be part of a growing, albeit sometimes chaotic, ecosystem. Aliens Group is not the usual corporate giant where processes are rigid and meticulously layered—it’s more fast-paced and less formal, which reflects both in their projects and recruitment.

How the Hiring Process Works

  1. Application and Resume Screening – Candidates first submit their applications online or via referrals. Given the volume of applicants, the initial screening tends to focus on key eligibility criteria such as relevant education, prior experience in real estate or construction, and basic technical skills.
  2. Technical Assessment – Aliens Group places significant weight on this round. It’s designed to verify core competencies whether for engineering, sales, or project management roles. The format may vary—sometimes a written test, other times a coding or design task depending on the job.
  3. First Round Interview (Technical) – Conducted by domain experts, this round dives into candidate’s practical knowledge, problem-solving abilities, and sometimes project-based discussions. The interviewers often expect candidates to showcase experience-driven insights rather than textbook answers.
  4. Second Round Interview (HR and Managerial) – This stage assesses cultural fit, communication skills, career aspirations, and salary expectations. Candidates can anticipate questions about handling challenges, teamwork, and alignment with Aliens Group’s rapid-growth ethos.
  5. Final Selection and Offer – Successful candidates receive offers based on role-specific salary bands. There’s occasional negotiation, but the group tends to maintain structured pay scales to ensure fairness across departments.
  6. Onboarding and Induction – Selected candidates undergo a brief orientation process, often inclusive of site visits and introduction to project teams, which helps new hires immediately grasp the operational realities.

The hiring process mirrors the company’s need for employees who can hit the ground running and handle shifting priorities. The emphasis on both technical and cultural facets is deliberate—Aliens Group believes success isn’t just about skills but how you adapt to their dynamic environment.

Interview Stages Explained

Technical Assessment

This is where many candidates feel the pressure. The assessment is tailored to filter out those who have theoretical knowledge but lack practical application. For example, engineers might be tested on design principles, construction methodologies, and even site problem diagnosis. Sales or marketing candidates could face scenario-based questions related to client engagement or market analysis.

Why this matters: Aliens Group operates in high-stakes environments where on-the-spot problem solving can make a huge difference. So, their technical screening isn’t just about academic prowess but real-world readiness.

Technical Interview

Once you clear the assessment, the technical interview is conducted by senior managers or technical leads. It’s conversational but probing. Expect questions that challenge your past projects, ask you to troubleshoot hypothetical situations, or even solve mini-problems on paper or whiteboard.

Interviewers often observe how you think aloud, break down a problem, and justify your decisions. They aren’t looking for perfect answers; rather, they want to see practical intelligence and honesty about what you know or don’t know.

HR Interview

At this stage, it feels less technical and more personal. The recruiter or HR manager tries to gauge your motivations, communication style, and cultural alignment. Questions often revolve around how you handle stress, your adaptability in fast-moving setups, and your future career goals.

Aliens Group’s culture emphasizes hustle and innovation, so showing a proactive mindset and enthusiasm for learning can tilt the scales in your favor. They also clarify salary expectations here, ensuring both parties are on the same page.

Examples of Questions Candidates Report

  • Technical Interview Questions: “Explain the process of soil testing in construction projects.” / “How would you prioritize tasks if multiple site issues arise simultaneously?” / “Describe a challenging project and how you resolved conflicts within the team.”
  • HR Questions: “Why do you want to join Aliens Group over other real estate firms?” / “Tell us about a time you failed and what you learned from it.” / “How do you manage tight deadlines and pressures?”
  • Situational Questions: “If a client is dissatisfied with the project progress, how do you communicate and manage expectations?” / “Describe your approach when assigned a task outside your expertise.”

Eligibility Expectations

Aliens Group looks for candidates who meet clear educational and experience benchmarks but also demonstrate practical skills. For technical roles, degrees in civil engineering, architecture, or related fields are often mandatory. Experience with construction sites, real estate projects, or technical software like AutoCAD or project management tools is highly valued.

For sales and marketing positions, a background in real estate sales or related industries with proven negotiation skills is desirable. Fresh graduates sometimes get considered if they show strong internship experience or relevant certifications.

Interestingly, the firm is flexible about age limits and prefers candidates with a growth mindset over rigid credential checklists. However, good communication in English and basic computer literacy are non-negotiable across most roles.

Common Job Roles and Departments

Aliens Group’s hiring spans multiple verticals. Here’s a snapshot of the most recurrent positions:

  • Civil Engineers: Site supervision, structural design, materials testing.
  • Project Managers: Overseeing timelines, budgets, client coordination.
  • Sales Executives: Client acquisition, property marketing, customer engagement.
  • Designers and Architects: Conceptual planning, interior layouts, compliance checks.
  • Finance and Accounts Personnel: Budget management, billing, cost analysis.
  • HR and Admin: Talent acquisition, employee engagement, compliance.

Each department has a slightly different recruitment approach reflecting the specific skills and personality traits required. For instance, sales roles emphasize communication tests, while engineering roles focus more on technical assessments.

Compensation and Salary Perspective

RoleEstimated Salary (INR per annum)
Junior Civil Engineer3,00,000 – 4,50,000
Project Manager8,00,000 – 12,00,000
Sales Executive3,50,000 – 6,00,000 (including incentives)
Architect4,00,000 – 7,00,000
Finance Executive3,00,000 – 5,00,000
HR Executive3,00,000 – 5,00,000

The figures above reflect typical compensation bands but can fluctuate based on candidate experience, city of posting, and negotiation. Aliens Group offers competitive packages for the middle tier of real estate companies, with added perks often tied to project performance bonuses or incentives, especially in sales roles.

Interview Difficulty Analysis

From the feedback gathered, Aliens Group’s interviews are moderately challenging. They do not aim to intimidate but expect a certain level of readiness and practical knowledge. Candidates consistently report that the technical rounds are the toughest, particularly because the questions are scenario-based rather than theoretical.

Compared to larger real estate giants or multinational construction firms, Aliens Group’s hiring is less bureaucratic but demands more adaptability. You won’t face multi-day elaborate panels here, but you must be prepared to demonstrate how you can contribute immediately.

What often trips candidates up is the fast pace and unpredictability of the rounds. Interviewers shift focus quickly, and you need to stay on your toes. The HR round, while friendlier, probes deeply into your motivations, so canned answers won’t cut it.

Preparation Strategy That Works

  • Research the Company Thoroughly: Understand Aliens Group’s projects, growth trajectory, and market position. This helps in tailoring your answers and showing genuine interest.
  • Brush Up Practical Skills: For technical roles, revisit core concepts and prepare to discuss your past projects with clarity. Practice problem-solving exercises relevant to real estate and construction.
  • Mock Interviews: Conduct mock sessions focusing on scenario-based questions and HR behavioral queries. This builds confidence and smoothens your narrative flow.
  • Communication is Key: Work on articulating your thoughts concisely. For sales roles especially, practice pitch-like explanations.
  • Prepare Questions: Have insightful questions ready for interviewers. It signals engagement and strategic thinking.
  • Know Your Expectations: Be clear about your salary expectations and career goals. Aliens Group values candidates who display realistic and aligned ambitions.

Work Environment and Culture Insights

Aliens Group’s culture resonates with a startup vibe despite being in real estate. The environment is fast-paced—deadlines can shift, priorities often evolve, and you might find yourself wearing multiple hats on a given day. Colleagues describe it as a place where initiative is rewarded but you must be ready to tackle challenges head-on.

Team dynamics are generally collaborative, but the pressure to deliver on ambitious projects can sometimes lead to long working hours. The management encourages innovative ideas, and there’s a visible thirst for continuous improvement, even if resources may sometimes be constrained compared to industry giants.

For candidates, this means joining Aliens Group is not just about a job, it’s about joining a journey that demands resilience, flexibility, and a proactive attitude.

Career Growth and Learning Opportunities

One of the often-highlighted positives is the exposure Aliens Group offers. Employees frequently get hands-on experience with different facets of real estate development early in their careers. Cross-functional learning is common—engineers might engage closely with sales teams, project managers handle budgeting and client communication, and so forth.

The company encourages skill development, sometimes sponsoring certifications relevant to the industry. Although promotions can feel competitive, internal mobility is possible if you demonstrate consistent performance and eagerness to take on responsibilities.

Unlike large corporations with rigid hierarchies, career paths here can be somewhat fluid, offering ambitious candidates room to shape their roles. However, that same fluidity requires you to be self-driven and ready to seize opportunities proactively.

Real Candidate Experience Patterns

Talking to individuals who’ve walked the Aliens Group interview path reveals some common themes. The initial technical tests often create anxiety, given their practical nature. But those who come prepared with project-based examples tend to breeze through the technical interviews.

Many recount the HR round as a make-or-break moment—where showcasing adaptability and cultural fit is as important as answering questions correctly. Some candidates note that the interviewers appreciate honesty about knowledge gaps rather than overconfidence.

Interestingly, the onboarding experience is usually swift. New hires get thrown into projects quickly, which can be daunting but also accelerates learning. The company’s less structured environment means you often learn on the job, which suits those who thrive in dynamic setups.

Comparison With Other Employers

If you put Aliens Group side by side with well-known real estate giants or multinational construction firms, you’ll notice some contrasts. Larger companies tend to have multi-layered, drawn-out hiring processes, with heavy emphasis on credentials and formal assessments. Aliens Group, by comparison, is more streamlined but expects you to demonstrate practical readiness immediately.

Salary packages generally fall into the mid-market range—not as high as premium multinational firms but competitive within national peers. The working environment is less formal, which some candidates appreciate for the entrepreneurial spirit, while others might find the lack of structure challenging.

This makes Aliens Group a viable choice for candidates aiming for early responsibility and fast growth, rather than those seeking a locked-in corporate ladder or rigid processes.

Expert Advice for Applicants

Coming from years of working with real estate recruiters and hiring managers, here’s what I’d tell anyone eyeing Aliens Group:

  • Don’t just memorize answers. The interviewers want to feel your thought process and authenticity.
  • Prepare stories. Real-life examples of challenges, teamwork, and problem resolution resonate more than textbook responses.
  • Mind your adaptability. Aliens Group’s environment can shift quickly. Indicate your comfort with uncertainty and multitasking.
  • Focus on alignment. Understand the company’s projects and ethos. Tailor your responses to show you’re not just looking for any job but specifically want to grow with Aliens Group.
  • Practice technical and behavioral rounds equally. Both carry weight, so neglecting soft skills is a mistake.
  • Network if possible. Referrals or insights from current employees can offer an edge and realistic hints about the team you might join.

Frequently Asked Questions

What types of technical interviews does Aliens Group conduct?

The technical interviews usually focus on real estate and construction knowledge for engineering roles, scenario-based problem solving, and relevant software skills. For non-engineering roles, assessments may be more about industry understanding and client handling skills.

How long does the complete hiring process take?

Typically, the entire process from application to final offer can range from two to four weeks. This varies based on role, location, and the urgency of hiring.

Are there any specific certifications that improve chances?

Certifications related to construction management, AutoCAD, project scheduling (like PMP), or real estate sales can boost your profile. Aliens Group appreciates candidates who continuously upgrade their skills.

What is the interview dress code?

While not overly formal, it’s best to stick to business casual for interviews. This shows professionalism without being stiff, aligning with the company's flexible yet serious culture.

Does Aliens Group conduct group discussions?

Group discussions are uncommon in Aliens Group’s hiring rounds. The focus remains on one-on-one interviews and technical assessments.

Final Perspective

Aliens Group represents the archetype of a growing real estate player with a strong focus on practical capabilities and cultural agility. Their hiring process underscores this—quick, focused, and aiming to identify candidates who can thrive in an energetic, often unpredictable environment.

For prospective applicants, this means preparation should go beyond just technical know-how. Understanding the company’s vision, preparing for situational questions, and demonstrating a flexible, proactive mindset are essential. Aliens Group’s journey is still evolving, so joining their team offers both challenges and exciting learning prospects for those who are ready to jump in and make an impact.

Aliens Group Interview Questions and Answers

Updated 21 Feb 2026

Quality Assurance Engineer Interview Experience

Candidate: Arjun Desai

Experience Level: Entry-level

Applied Via: Campus Recruitment

Difficulty: Easy

Final Result:

Interview Process

2 rounds

Questions Asked

  • What is the difference between manual and automated testing?
  • Explain the software testing lifecycle.
  • Have you used any testing tools before?

Advice

Understand basic testing concepts and be confident in explaining them.

Full Experience

The process was straightforward with an initial written test followed by an HR interview. The questions were mostly theoretical but relevant to the role. The team was welcoming and provided clear information about the job expectations.

UX Designer Interview Experience

Candidate: Sneha Patel

Experience Level: Mid-level

Applied Via: Job Portal

Difficulty:

Final Result: Rejected

Interview Process

3 rounds

Questions Asked

  • Walk us through your design portfolio.
  • How do you incorporate user feedback into your designs?
  • What design tools are you proficient in?

Advice

Work on articulating your design decisions more clearly during interviews.

Full Experience

The interviewers were friendly and asked me to present my portfolio in detail. The technical round included a design challenge with a tight deadline. Although I got good feedback on creativity, they wanted stronger communication skills.

Project Manager Interview Experience

Candidate: Vikram Singh

Experience Level: Senior

Applied Via: Referral

Difficulty: Hard

Final Result:

Interview Process

4 rounds

Questions Asked

  • Describe your experience managing cross-functional teams.
  • How do you handle project scope changes?
  • Explain risk management strategies you have used.
  • Provide an example of a challenging project and how you delivered it on time.

Advice

Prepare detailed examples of leadership and conflict resolution.

Full Experience

The interview process was intense with multiple rounds including HR, technical, and leadership panels. They focused heavily on behavioral questions and situational judgment. I appreciated the thoroughness as it reflected the company's high standards.

Data Analyst Interview Experience

Candidate: Anjali Mehta

Experience Level: Entry-level

Applied Via: Company Website

Difficulty: Easy

Final Result: Rejected

Interview Process

2 rounds

Questions Asked

  • What is the difference between supervised and unsupervised learning?
  • Describe a time you worked with large datasets.
  • How do you ensure data accuracy?

Advice

Gain more hands-on experience with SQL and data visualization tools.

Full Experience

The first round was an online aptitude test followed by a video interview. The questions were straightforward but I felt underprepared for some technical questions. The feedback was that I needed stronger practical skills.

Software Engineer Interview Experience

Candidate: Rohit Sharma

Experience Level: Mid-level

Applied Via: LinkedIn

Difficulty:

Final Result:

Interview Process

3 rounds

Questions Asked

  • Explain OOP concepts with examples.
  • How do you handle version control in a team?
  • Write a function to reverse a linked list.

Advice

Brush up on data structures and be ready to discuss past projects in detail.

Full Experience

The first round was a phone screening focusing on my resume and basic programming concepts. The second round was a technical test involving coding problems on arrays and linked lists. The final round was an in-person interview where they asked about my previous work experience and some system design questions. Overall, the process was smooth and the interviewers were friendly.

View all interview questions

Frequently Asked Questions in Aliens Group

Have a question about the hiring process, company policies, or work environment? Ask the community or browse existing questions here.

Common Interview Questions in Aliens Group

Q: In a sports contest there were m medals awarded on n successive days (n > 1). 1. On the first day 1 medal and 1/7 of the remaining m - 1 medals were awarded. 2. On the second day 2 medals and 1/7 of the now remaining medals was awarded; and so on.On the nth and last day, the remaining n medals were awarded.How many days did the contest last, and how many medals were awarded altogether?

Q: A rich merchant had collected many gold coins. He did not want anybody to know about them. One day his wife asked, "How many gold coins do we have?" After pausing a moment, he replied, "Well! If I divide the coins into two unequal numbers, then 32 times the difference between the two numbers equals the difference between the squares of the two numbers."The wife looked puzzled. Can you help the merchant's wife by finding out how many gold coins they have?

Q: Suppose a newly-born pair of rabbits, one male, one female, are put in a field. Rabbits are able to mate at the age of one month so that at the end of its second month a female can produce another pair of rabbits. Suppose that our rabbits never die and that the female always produces one new pair (one male, one female) every month from the second month on.

Q: 9 cards are there. You have to arrange them in a 3*3 matrix. Cards are of 4 colors. They are red, yellow, blue and green. Conditions for arrangement: one red card must be in first row or second row. 2 green cards should be in 3rd column. Yellow cards must be in the 3 corners only. Two blue cards must be in the 2nd row. At least one green card in each row.

Q: There are two balls touching each other circumferencically. The radius of the big ball is 4 times the diameter of the small all. The outer small ball rotates in anticlockwise direction circumferencically over the bigger one at the rate of 16 rev/sec. The bigger wheel also rotates anticlockwise at N rev/sec. What is 'N' for the horizontal line from the centre of small wheel always is horizontal.

Q: There are 3 clans in an island - The Arcs who never lie, the Dons who always lie and the Slons who lie alternately with the truth. Once a tourist meets 2 guides who stress that the other is a Slon. They proceed on a tour and see a sports meet. The first guide says that the prizes have been won in the order Don, Arc, Slon. The other says that, the order is Slon, Don, Arc. (the order need not be exact). To which clan did each of the guides and the players belong? ...

Q: 3 policemen and 3 thieves had to cross a river using a small boat. Only two can use the boat for a trip. All the 3 policemen and only 1 thief knew to ride the boat. If 2 thieves and 1 policeman were left behind they would kill him. But none of them escaped from the policemen. How would they be able to cross the river?

Q: The citizens of planet nigiet are 8 fingered and have thus developed their decimal system in base 8. A certain street in nigiet contains 1000 (in base 8) buildings numbered 1 to 1000. How many 3s are used in numbering these buildings?

Q: The egg vendor calls on his first customer and sells half his eggs and half an egg. To the second customer, he sells half of what he had left and half an egg and to the third customer he sells half of what he had then left and half an egg. By the way he did not break any eggs. In the end three eggs were remaining . How many total eggs he was having ?

Q: A vessel is full of liquid. From the vessel, 1/3rd of the liquid evaporates on the first day. On the second day 3/4th of the remaining liquid evaporates. What fraction of the volume is present at the end of the second day

Q: Jarius and Kylar are playing the game. If Jarius wins, then he wins twice as many games as Kylar. If Jarius loses, then Kylar wins as the same number of games that Jarius wins. How many do Jarius and Kylar play before this match?

Q: In a Park, N persons stand on the circumference of a circle at distinct points. Each possible pair of persons, not standing next to each other, sings a two-minute song ? one pair immediately after the other. If the total time taken for singing is 28 minutes, what is N?

Q: Consider a series in which 8 teams are participating. each team plays twice with all other teams. 4 of them will go to the semi final. How many matches should a team win, so that it will ensure that it will go to semi finals.?

Q: An escalator is descending at constant speed. A walks down and takes 50 steps to reach the bottom. B runs down and takes 90 steps in the same time as A takes 10 steps. How many steps are visible when the escalator is not operating. 

Q: A family X went for a vacation. Unfortunately it rained for 13 days when they were there. But whenever it rained in the mornings, they had clear afternoons and vice versa. In all they enjoyed 11 mornings and 12 afternoons. How many days did they stay there totally?

Q: Joe started from Bombay towards Pune and her friend julie in opposite direction. they met at a point . distance traveled by joe was 1.8 miles more than that of julie.after spending some both started there way. joe reaches in 2 hours while julie in 3.5 hours.Assuming both were traveling with constant speed. What is the distance between the two cities.

Q: There are some chickens in a poultry. They are fed with corn. One sack of corn will come for 9 days. The farmer decides to sell some chickens and wanted to hold 12 chicken with him. He cuts the feed by 10% and sack of corn comes for 30...

Q: Motorboat A leaves shore P as B leaves Q; they move across the lake at a constant speed. They meet first time 600 yards from P. Each returns from the opposite shore without halting, and they meet 200 yards from. How long is the lake?

Q: In mathematics country 1,2,3,4....,8,9 are nine cities. Cities which form a no. that is divisible by 3 are connected by air planes. (e.g. cities 1 & 2 form no. 12 which divisible by 3 then 1 is connected to city 2). Find the total no. of ways you can go to 8 if you are allowed to break the journeys.

Q: Four persons have to cross the bridge they are having one torch light. Four persons take 1,2,5,10 minutes respectively, when two persons are going they will take the time of the slowest person. What is the time taken to cross by all of them.

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