Ques:- A is thrice as efficient as B and is, therefore, able to finish a piece of work 10 days earlier than B. In how many days A and B will finish it together?
Recent Answer : Added by Abhi Chatterjee On 2022-01-08 16:05:10:
Let n be the number of days it takes A and B, working together, to finish. And we know B=A+10 and B=3A, so:
3A=A+10
2A=10
A=5
Then B=15
So:
1/A + 1/B=1/n where n is the total amount of days. So:
1/5 + 1/15=1/n
3n+n=15
n=15/4 days
Ques:- The sides of a cube are in the ratio 1:2 the ratio of their volume is?
Ques:- There are some houses in a street back to back .And they that house behind 10 was 23. How many houses in the street?
Recent Answer : Added by Admin On 2020-05-17 12:02:13:
26
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Ques:- 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.
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Ques:- The length of a train and that of a platform are equal. If with a speed of 90 k/hr, the train crosses the platform in one minute, then the length of the train (in meters) is:
Ques:- 7589 ? ? = 3434
A. 3721
B. 4155
C. 3246
D. 11023
E. None of these
Recent Answer : Added by Indupriya On 2022-05-17 09:06:46:
4155
Ques:- The C.I. on a certain sum for 2 years Rs.41 and the simple interest is Rs.40. What is the rate percent?
Ques:- How big will an angle of one and a half degree look through a glass that magnifies things three times?
Ques:- These words follow a logical progression: CODIFYLAMINASTOVERESETJOKULQUIRESWhich one of these comes next?REST, GRAIL, STOIC, ORDEAL
Ques:- The number of prime number between 0 and 100 is
A. 17
B. 25
C. 31
D. 39
Recent Answer : Added by Shidane On 2021-08-18 01:31:09:
B.25
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Ques:- The seven digits in this subtraction problem are 0, 1, 2, 3, 4, 5 and 6. Each letter represents the same digit whenever it occurs. D A D C B – E B E G is equal to B F E G.What digit is represented by each letter?
Ques:- Are you a fresher?
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Ques:- Here is a sequence of numbers: 1 11 21 1211 111221 It seems to be a strange sequence, but yet there is a system behind it… What is the next term in this sequence?
Recent Answer : Added by Kajal Thosar On 2022-05-17 09:09:10:
1121221
Ques:- Two trains 240 metres and 270 metres in length are running towards each other on parallel lines, one at the rate of 60 kmph and another at 48 kmph. How much time will they take to cross each other?
A. 14 sec.
B. 15 sec.
C. 16 sec.
D. 17 sec.
Recent Answer : Added by Somaskandhan On 2022-09-22 16:39:53:
17 secs
Ques:- A car averages 55 mph for the first 4 hours of a trip and averages 70 mph for each additional hour. The average speed for the entire trip was 60 mph. How many hours long is the trip?
Recent Answer : Added by Ant On 2023-05-31 19:22:54:
55 + 70 = 125
125/14hrs = 60 mph
14 hours
Ques:- There is a 50m long army platoon marching ahead. The last person in the platoon wants to give a letter to the first person leading the platoon. So while the platoon is marching he runs ahead, reaches the first person and hands over the letter to him and without stopping he runs and comes back to his original position. In the mean time the whole platoon has moved ahead by 50m. The question is how much distance did the last person cover in that time. Assuming that he ran the whole distance with uniform speed.
Recent Answer : Added by Admin On 2020-05-17 12:00:37:
The last person covered 120.71 meters.
It is given that the platoon and the last person moved with
uniform speed. Also, they both moved for the identical
amount of time. Hence, the ratio of the distance they
covered – while person moving forward and backword – are
equal.
Let’s assume that when the last person reached the first
person, the platoon moved X meters forward.
Thus, while moving forward the last person moved (50+X)
meters whereas the platoon moved X meters.
Similarly, while moving back the last person moved [50-(50-
X)] X meters whereas the platoon moved (50-X) meters.
Now, as the ratios are equal,
(50+X)/X = X/(50-X)
(50+X)*(50-X) = X*X
Solving, X=35.355 meters
Thus, total distance covered by the last person
= (50+X) + X
= 2*X + 50
= 2*(35.355) + 50
= 120.71 meters
Note that at first glance, one might think that the total
distance covered by the last person is 100 meters, as he
ran the total lenght of the platoon (50 meters) twice.
TRUE, but that’s the relative distance covered by the last
person i.e. assuming that the platoon is stationary.
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Ques:- One quality of wheat at Rs. 9.30 per kg is mixed with another quality at a certain rate in the ratio 8 : 7. If the mixture so formed be worth Rs. 10 per kg. What is the rate per kg of the second quality of wheat?
A. Rs. 10.30
B. Rs. 10.60
C. Rs. 10.80
D. Rs. 11
Recent Answer : Added by Afridi On 2022-08-14 18:01:09:
Let n be the number of days it takes A and B, working together, to finish. And we know B=A+10 and B=3A, so:
3A=A+10
2A=10
A=5
Then B=15
So:
1/A + 1/B=1/n where n is the total amount of days. So:
1/5 + 1/15=1/n
3n+n=15
n=15/4 days