About danfoss
Company Description
Danfoss is a global leader in engineering solutions, dedicated to providing innovative and sustainable technologies that improve energy efficiency and reduce carbon emissions. Headquartered in Nordborg, Denmark, the company specializes in areas such as heating, cooling, and motion control, serving various industries including HVAC, food and beverage, and automotive. Danfoss fosters a collaborative and inclusive work culture that emphasizes innovation and employee development. The job environment is characterized by a strong commitment to sustainability and social responsibility, encouraging employees to contribute to meaningful change and to take ownership of their work. Employees at Danfoss benefit from a supportive atmosphere that promotes continuous learning, teamwork, and respect for diversity.
Engineering Role Interview Questions
Q1: Can you describe a challenging engineering problem you faced and how you resolved it?
In a previous project, we faced a significant issue with thermal efficiency in a heating system. I conducted a detailed analysis of the system's components and identified that insulation was inadequate. I collaborated with the team to redesign the insulation system, which improved efficiency by 15%.
Q2: How do you stay updated with the latest engineering technologies and trends?
I regularly attend industry conferences, participate in webinars, and follow relevant journals and publications. Additionally, I am a member of several professional engineering organizations where I can exchange knowledge with peers.
Q3: What software tools are you proficient in, and how have you used them in your projects?
I am proficient in AutoCAD, MATLAB, and SolidWorks. In my last project, I used AutoCAD to create detailed schematics for a new product design, which helped streamline the prototyping process.
Q4: Describe a time when you had to work under tight deadlines. How did you manage your time?
During a crucial project phase, we had a week to finalize the design before client presentation. I prioritized tasks by focusing on critical deliverables and communicated effectively with my team to delegate responsibilities. We successfully met the deadline with a polished presentation.
Q5: How do you approach teamwork in an engineering environment?
I believe in open communication and leveraging each team member's strengths. I actively seek input from all members and encourage brainstorming sessions to come up with innovative solutions.
Sales Role Interview Questions
Q1: Can you describe your sales experience in the engineering or manufacturing sector?
I have over five years of sales experience in the HVAC industry, where I managed key accounts and increased sales by 25% year-over-year by developing strong client relationships and identifying their specific needs.
Q2: How do you handle objections from potential clients?
I listen carefully to the client's concerns and validate their feelings. Then, I provide evidence-based solutions and share case studies that demonstrate how our products have successfully addressed similar issues for other clients.
Q3: What strategies do you use to identify and pursue new business opportunities?
I utilize market research and networking to identify potential leads. Additionally, I leverage social media platforms and industry events to connect with prospects and establish relationships.
Q4: Describe a successful negotiation you conducted and what made it successful.
In a recent negotiation with a large client, I focused on understanding their budget constraints while emphasizing the long-term savings our product would provide. By presenting a tailored solution, we reached a mutually beneficial agreement that resulted in a significant contract.
Q5: How do you measure your sales performance?
I track key performance indicators such as sales volume, client retention rates, and conversion rates. I also seek feedback from clients to assess satisfaction and identify areas for improvement.
Project Management Role Interview Questions
Q1: What project management methodologies are you familiar with, and which do you prefer?
I am familiar with Agile, Waterfall, and Lean methodologies. I prefer Agile for projects requiring flexibility and rapid iterations, as it allows for adaptive planning and encourages stakeholder collaboration.
Q2: Can you give an example of a project you managed from start to finish?
I managed a cross-departmental project aimed at developing a new product line. I coordinated with R&D, marketing, and sales to ensure alignment and successfully delivered the project on time and within budget, resulting in a successful product launch.
Q3: How do you prioritize tasks in a project with multiple stakeholders?
I establish a clear project timeline and break down tasks based on urgency and impact. I engage with stakeholders regularly to reassess priorities and ensure that everyone's expectations are managed.
Q4: Describe a conflict that arose in one of your projects and how you resolved it.
During a project, there was a disagreement between the engineering and marketing teams regarding product specifications. I facilitated a meeting to clarify each team's perspective and encouraged collaborative problem-solving, which resulted in a compromise that satisfied both sides.
Q5: What tools do you use for project management and communication?
I typically use tools like Microsoft Project and Trello for task management, and Slack for team communication. These tools help in maintaining transparency and keeping everyone informed about project status.
Conclusion Interview Questions
Danfoss is a dynamic and innovative company that values its employees and their contributions. The interview questions and answers provided for various job roles highlight the skills and competencies that align with Danfoss's mission of creating sustainable engineering solutions.
Company Background and Industry Position
When you hear Danfoss, think innovation quietly powering the world’s infrastructure. Founded in 1933, this Danish powerhouse has grown into a global leader in engineering solutions for heating, cooling, and industrial automation. Their products don’t just sit on shelves; they're embedded in energy-efficient buildings, green tech innovations, and complex manufacturing plants worldwide.
What sets Danfoss apart in the industry is its commitment to sustainability meshed with advanced engineering. The company operates across multiple continents, which means its recruitment and hiring processes are designed to fit a global culture while maintaining local relevance. For candidates, this means aligning with a brand that values adaptability, technical excellence, and a forward-thinking mindset.
In today’s highly competitive manufacturing and tech sectors, Danfoss competes not just on product innovation but on talent attraction. Their ability to blend climate-conscious tech solutions with digital transformation trends places them in a unique spot—making the hiring process rigorous but also rewarding for candidates who resonate with their mission.
How the Hiring Process Works
- Application Submission: Candidates start by submitting their resumes via the official Danfoss careers portal or through reputable job platforms. The system filters applications based on keywords matching specific job roles and eligibility criteria.
- Initial Screening: A recruiter or an automated system reviews applications to shortlist candidates who meet the baseline requirements. Expect focus on educational background, relevant experience, and alignment with the company's values.
- First Round Interview: Usually, this is a telephonic or video interview, designed to assess general fit and communication skills. It’s less technical and more about understanding your motivations and cultural alignment.
- Technical Interview Round: This is where your expertise is tested. Depending on the role, you may face practical problems, case studies, or system design questions. For engineering positions, expect deep dives into your technical knowledge.
- HR Interview: The HR round explores compensation expectations, work ethics, and behavioral competencies. It’s also when salary discussions and contract details come into play.
- Offer and Onboarding: Successful candidates receive an offer followed by onboarding procedures that introduce them to Danfoss culture and systems.
This sequence isn’t random. Every step weeds out mismatches early, saving time for both parties and ensuring candidates who move forward are better suited for the role and company culture.
Interview Stages Explained
Initial Screening – The Gatekeeper
This is your first impression moment, and it’s more than just ticking boxes. Recruiters look for candidates who demonstrate not just qualifications but enthusiasm for Danfoss' sustainability goals and innovative spirit. Expect questions like “Why Danfoss?” or “How do you see your role contributing to our product line?” The goal is to gauge genuine interest and communication clarity.
Technical Interview – Proving Your Mettle
Here is where technical depth meets practical application. For example, mechanical engineers might be challenged with questions about thermal dynamics or fluid mechanics, while software engineers could be asked to navigate control system algorithms or embedded software challenges. This round aims to reveal problem-solving approaches and how you think under pressure—not just what you know.
Candidates often remark that while the questions are challenging, interviewers appreciate when you talk through your reasoning rather than just delivering answers. It’s about demonstrating how you tackle complex problems, reflecting real work scenarios.
HR Interview – The Cultural Compatibility Check
This isn’t just a formality. Danfoss HR teams probe your adaptability, teamwork skills, and alignment with the company’s values, such as innovation and sustainability. They also clarify salary range expectations and negotiate terms. Transparency is key here—being upfront about your expectations can save time.
Interestingly, candidates who prepare examples of past challenges and solutions tend to stand out, as storytelling brings these competencies to life.
Examples of Questions Candidates Report
- “Can you explain how you would optimize energy efficiency in an industrial heating system?”
- “Describe a time you faced a technical setback and how you overcame it.”
- “What do you know about Danfoss’ role in sustainability and energy solutions?”
- “How do you prioritize tasks when handling multiple projects?”
- “Walk us through your experience with PLC programming or automation software (role-specific).”
- “Why did you choose this career path and how does it align with Danfoss’ vision?”
- “How do you handle team disagreements, especially under tight deadlines?”
Eligibility Expectations
The eligibility bar at Danfoss is carefully calibrated to balance technical proficiency with cultural fit. For engineering roles, a relevant degree—often in mechanical, electrical, or software engineering—is essential. Additionally, some positions require specific certifications or hands-on experience with industry-standard tools and technologies.
For entry-level jobs, companies sometimes weigh internship experiences, academic projects, and demonstrated enthusiasm for the field heavily. Mid to senior-level roles demand proven results, leadership experience, and often, an ability to manage cross-functional teams.
Fluency in English is a common requirement given Danfoss' international footprint. For roles in specific regions, local language skills can be an asset but are not always a dealbreaker.
Common Job Roles and Departments
Danfoss’ diverse business units open doors for a variety of talent:
- Engineering and R&D: Mechanical, Electrical, Software, and Industrial Automation Engineers.
- Sales and Marketing: Professionals driving customer engagement and market penetration in energy and automation sectors.
- Supply Chain and Manufacturing: Roles focusing on process optimization, procurement, and logistics.
- Quality and Compliance: Experts ensuring products meet stringent international standards.
- Corporate Functions: HR, Finance, Legal, and IT professionals supporting the global operation.
The recruitment approach subtly shifts depending on the role. Engineering roles lean heavily on technical interviews, whereas sales and corporate functions emphasize behavioral and situational assessments.
Compensation and Salary Perspective
| Role | Estimated Salary |
|---|---|
| Entry-Level Mechanical Engineer | $55,000 - $70,000 |
| Senior Software Engineer | $90,000 - $120,000 |
| Sales Manager | $75,000 - $110,000 + Commission |
| Supply Chain Analyst | $60,000 - $80,000 |
| HR Business Partner | $70,000 - $95,000 |
These figures can vary significantly by region and level of experience. Danfoss tends to offer competitive packages that include benefits aligned with global standards—healthcare, pension plans, and sometimes performance incentives.
Interview Difficulty Analysis
From what candidates share, the interview difficulty generally sits in the moderate-to-challenging range. It’s not a walk in the park, especially for technical roles where you’ll be expected to demonstrate both breadth and depth of knowledge. But it’s not about trying to stump you either—it’s designed to assess real-world problem-solving skills rather than textbook memorization.
HR rounds are usually more conversational, though they pepper in situational questions that test emotional intelligence and adaptability. Many candidates report feeling that the process is thorough but fair, and that interviewers often encourage them to ask questions, creating a comfortable atmosphere.
Preparation Strategy That Works
- Research Danfoss Deeply: Understand their products, sustainability goals, and industry challenges. This background helps you tailor your answers and show authentic interest.
- Polish Technical Fundamentals: Revisit core concepts relevant to your role. For engineers, solving previous project problems aloud helps simulate the interview vibe.
- Practice Behavioral Questions: Prepare real examples for common competency questions using the STAR method (Situation, Task, Action, Result), but keep it natural.
- Mock Interviews: Simulate technical and HR interviews with peers or mentors to build confidence and receive feedback.
- Understand Salary Ranges: Knowing market standards helps you negotiate realistically during the HR round.
- Prepare Smart Questions: Interviewers appreciate candidates who ask insightful questions about company culture, future projects, or team dynamics.
Work Environment and Culture Insights
Danfoss’ culture is often described by employees as dynamic yet supportive, fostering innovation while maintaining a strong ethical compass. Sustainability isn’t just a buzzword here—it’s embedded in everyday work and decision-making.
Their work environment encourages cross-functional collaboration, with a flat hierarchy in many departments facilitating open communication. Flexibility is also a growing focus, especially post-pandemic, with many teams adopting hybrid work models.
What candidates usually notice is the company’s commitment to continuous learning and respect for diverse perspectives, which creates a sense of belonging even in a global corporation.
Career Growth and Learning Opportunities
Danfoss invests heavily in internal development programs, including leadership training, technical upskilling, and global mobility. Many employees share stories about starting in technical roles and moving into project management or innovation strategy within a few years.
The company’s growth agenda means they are always on the lookout for employees who show initiative and a willingness to embrace new challenges. Learning is encouraged not only through formal programs but also by working alongside industry experts on cutting-edge projects.
Real Candidate Experience Patterns
From firsthand accounts, candidates often remark on the professionalism of Danfoss interviewers. Many appreciate the transparent communication throughout the process and the sense that interviewers genuinely want to understand their background. That said, some feel the technical rounds can be intense, particularly if you’re not used to solving problems on the spot.
On the flip side, HR interviews tend to be more relaxed, often leaving candidates feeling heard and understood. Some have noted that feedback is sometimes delayed, which can be a source of anxiety, but overall, the experience leans positive.
A memorable anecdote: one candidate shared how, during the technical interview, the panel encouraged them to explore alternative approaches rather than just the 'right answer'—highlighting Danfoss’ appreciation for creativity and deeper understanding.
Comparison With Other Employers
| Aspect | Danfoss | Typical Competitors |
|---|---|---|
| Interview Rigour | Moderate to challenging, balanced technical and cultural fit focus | Often more technical-heavy, less emphasis on culture |
| Global Reach | Strong international presence with diverse teams | Varies; some local, some global |
| Salary Competitiveness | Above average with comprehensive benefits | Can be higher in tech giants, lower in traditional manufacturing |
| Work Culture | Collaborative, innovation-driven, sustainable | Varies, often more hierarchical in manufacturing peers |
| Career Development | Robust internal programs and mobility | Varies; some offer extensive, others limited |
Compared to peers in the engineering and manufacturing sectors, Danfoss positions itself as a modern, employee-centric organization with a strong sustainability ethos. This can be a deciding factor for candidates choosing between similar companies.
Expert Advice for Applicants
Don’t just prepare to answer questions—prepare to engage. Showing curiosity about Danfoss’ products and challenges signals alignment with their vision. When tackling interview questions, narrate your thought process clearly; interviewers appreciate the journey more than just the destination.
Remember that the hiring process is a two-way street. Use it to assess if Danfoss fits your career aspirations and values. Leverage your network to connect with current or former employees for insider insights—they can reveal subtle nuances that formal websites won’t.
Lastly, maintain patience and persistence. Sometimes the recruitment rounds span several weeks, and it’s easy to feel in limbo. Keeping proactive communication and expressing genuine enthusiasm can keep you top of mind.
Frequently Asked Questions
What types of interview questions does Danfoss typically ask?
Expect a mix of technical questions relevant to your role, behavioral questions exploring your problem-solving and teamwork skills, and situational questions assessing how you handle challenges. For technical positions, practical problem-solving exercises are common.
How many rounds are there in the Danfoss selection process?
Typically, you’ll go through three to five rounds including an initial screening, a technical interview, and an HR interview. Some roles might add an assessment center or case study round depending on seniority and function.
What is the eligibility criterion for applying to Danfoss?
Generally, candidates need relevant educational qualifications, appropriate work experience, and proficiency in English. Specific certifications or skills may be required depending on the job role, such as knowledge of automation tools or mechanical design principles.
How should I negotiate salary during the HR interview?
Do your homework on industry standards and Danfoss’ reputation for competitive pay. Be transparent about your expectations while considering the full compensation package, including benefits. Demonstrate flexibility but know your worth.
Is prior experience with sustainability projects preferred?
Given Danfoss’ focus on energy efficiency and sustainability, having experience or a genuine interest in these areas can be a strong advantage but is not always mandatory. It helps demonstrate alignment with their core values.
Final Perspective
Landing a job at Danfoss is more than just passing interviews—it’s about joining a global community driven by innovation and a commitment to sustainability. The hiring process might test your technical chops and cultural fit, but it ultimately seeks candidates who can contribute meaningfully to the company’s mission.
For job seekers, the key lies in preparation that balances technical knowledge, strategic thinking, and authentic engagement with the company’s values. It’s a journey that challenges you but opens doors to impactful work, career growth, and being part of a forward-looking organization.
So, if you’re aiming to join Danfoss, focus on telling your story convincingly, understanding their business landscape, and showing how you can power their vision into reality. It’s not just about the next job—it’s about being part of a global solution.
danfoss Interview Questions and Answers
Updated 21 Feb 2026Electrical Engineer Interview Experience
Candidate: Emma Garcia
Experience Level: Entry-level
Applied Via: University career fair
Difficulty:
Final Result:
Interview Process
3
Questions Asked
- Explain circuit design principles.
- Have you worked with PLCs?
- Describe a project involving electrical systems.
- How do you stay updated with industry standards?
- Why choose Danfoss?
Advice
Gain practical experience and be ready to discuss technical projects in detail.
Full Experience
After meeting the recruiter at the career fair, I was invited to a phone interview followed by a technical interview. The technical round involved problem-solving and questions about my university projects. Despite not advancing further, the interviewers were supportive and provided feedback.
Sales Engineer Interview Experience
Candidate: David Kim
Experience Level: Mid-level
Applied Via: Recruiter outreach
Difficulty: Easy
Final Result:
Interview Process
2
Questions Asked
- How do you approach technical sales?
- Describe a time you closed a difficult deal.
- What do you know about Danfoss products?
- How do you handle customer objections?
- Are you comfortable with travel?
Advice
Demonstrate strong communication skills and product knowledge.
Full Experience
The recruiter first conducted a phone screening to assess my background and fit. The second round was with the sales manager who asked behavioral and situational questions. The process was straightforward and focused on my sales experience and technical understanding.
Project Manager Interview Experience
Candidate: Sara Patel
Experience Level: Senior
Applied Via: LinkedIn job posting
Difficulty:
Final Result:
Interview Process
2
Questions Asked
- Describe your experience managing cross-functional teams.
- How do you handle project delays?
- Explain your familiarity with Agile methodologies.
- What KPIs do you track in projects?
- Why do you want to join Danfoss?
Advice
Highlight leadership experience and ability to manage complex projects.
Full Experience
The first round was a phone interview with HR focusing on my background and motivation. The second was a video interview with the hiring manager and team members where I discussed my project management approach and past successes. The interviewers valued clear communication and organizational skills.
Software Developer Interview Experience
Candidate: Michael Lee
Experience Level: Entry-level
Applied Via: Referral from current employee
Difficulty:
Final Result:
Interview Process
4
Questions Asked
- Explain object-oriented programming concepts.
- Write a function to reverse a linked list.
- How do you ensure code quality?
- Describe your experience with embedded systems.
- Why Danfoss and not other companies?
Advice
Practice coding problems and be prepared to explain your thought process clearly.
Full Experience
The process included an initial HR interview, a technical phone screen, a coding test, and a final onsite interview. The coding test was timed and required knowledge of data structures. The onsite included behavioral questions and a system design discussion. Although I didn’t get the offer, the experience was valuable.
Mechanical Engineer Interview Experience
Candidate: Alice Johnson
Experience Level: Mid-level
Applied Via: Online application via company website
Difficulty:
Final Result:
Interview Process
3
Questions Asked
- Explain the thermodynamic principles behind refrigeration cycles.
- Describe a challenging mechanical design project you worked on.
- How do you approach troubleshooting mechanical failures?
- What CAD software are you proficient in?
- Why do you want to work at Danfoss?
Advice
Brush up on core mechanical engineering concepts and be ready to discuss past projects in detail.
Full Experience
The interview process started with an HR screening call, followed by a technical phone interview focusing on mechanical engineering fundamentals. The final round was an in-person interview with the engineering team where I was asked to solve practical problems and discuss my previous work. The team was friendly and focused on problem-solving skills.
Frequently Asked Questions in danfoss
Have a question about the hiring process, company policies, or work environment? Ask the community or browse existing questions here.
Common Interview Questions in danfoss
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 man has a wolf, a goat, and a cabbage. He must cross a river with the two animals and the cabbage. There is a small rowing-boat, in which he can take only one thing with him at a time. If, however, the wolf and the goat are left alone, the wolf will eat the goat. If the goat and the cabbage are left alone, the goat will eat the cabbage. How can the man get across the river with the two animals and the cabbage?
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: A rich man died. In his will, he has divided his gold coins among his 5 sons, 5 daughters and a manager. According to his will: First give one coin to manager. 1/5th of the remaining to the elder son.Now give one coin to the manager and 1/5th of the remaining to second son and so on..... After giving coins to 5th son, divided the remaining coins among five daughters equally.All should get full coins. Find the minimum number of coins he has?
Q: Consider a pile of Diamonds on a table. A thief enters and steals 1/2 of the total quantity and then again 2 extra from the remaining. After some time a second thief enters and steals 1/2 of the remaining+2. Then 3rd thief enters and steals 1/2 of the remaining+2. Then 4th thief enters and steals 1/2 of the remaining+2. When the 5th one enters he finds 1 diamond on the table. Find out the total no. of diamonds originally on the table before the 1st thief entered.
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: 36 people {a1, a2, ..., a36} meet and shake hands in a circular fashion. In other words, there are totally 36 handshakes involving the pairs, {a1, a2}, {a2, a3}, ..., {a35, a36}, {a36, a1}. Then size of the smallest set of people such that the res...
Q: T, U, V are 3 friends digging groups in fields. If T & U can complete i groove in 4 days &, U & V can complete 1 groove in 3 days & V & T can complete in 2 days. Find how many days each takes to complete 1 groove individually.
Q: A light bulb is hanging in a room. Outside of the room there are three switches, of which only one is connected to the lamp. In the starting situation, all switches are 'off' and the bulb is not lit. If it is allowed to check in the room only once.How would you know which is the switch?
Q: At 6?o a clock ticks 6 times.The time between first and last ticks is 30 seconds.How long does it tick at 12?o clock?2.A hotel has 10 storey. Which floor is above the floor below the floor, below the floor above the floor, below the floor above the fifth.
Q: Every day a cyclist meets a train at a particular crossing .The road is straight before the crossing and both are travelling in the same direction.Cyclist travels with a speed of 10 kmph.One day the cyclist come late by 25 minutes and meets the train 5 km before the crossing.What is the speed of the train?
Q: A long, long time ago, two Egyptian camel drivers were fighting for the hand of the daughter of the sheik of Abbudzjabbu. The sheik, who liked neither of these men to become the future husband of his daughter, came up with a clever plan: a race would dete
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: Give two dice - one is a standard dice, the other is blank (nothing painted on any of the faces). The problem is to paint the blank dice in such a manner so that when you roll both of them together, the sum of both the faces should lie between 1 and 12. Numbers from 1-12 (both inclusive) equally likely.
Q: If I walk with 30 miles/hr i reach 1 hour before and if i walk with 20 miles/hr i reach 1 hour late. Find the distance between 2 points and the exact time of reaching destination is 11 am then find the speed with which it walks.
Q: There are four dogs/ants/people at four corners of a square of unit distance. At the same instant all of them start running with unit speed towards the person on their clockwise direction and will always run towards that target. How long does it take for them to meet and where?
Q: A man driving the car at twice the speed of auto one day he was driven car for 10 min. and car is failed. he left the car and took auto to go to the office .he spent 30 min. in the auto. what will be the time take by car to go office?