Time and work Questions and Answers updated daily – Aptitude



12 Time and work Questions and answers section with explanation for various online exam preparation, various interviews, Aptitude Time and work online test. Time and work Questions with detailed description, explanation will help you to master the topic.

Time and work Questions

1. A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs. 3200. With the help of C, they completed the work in 3 days. How much is to be paid to C?



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Correct Ans:400
Explanation:


2. A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs. 3200. With the help of C, they completed the work in 3 days. How much is to be paid to C



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Correct Ans:400
Explanation:


3. A can do a piece of work in 4 hours . A and C together can do it in just 2 hours, while B and C together need 3 hours to finish the same work. In how many hours B can complete the work ?



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Correct Ans:12 hours
Explanation:


4. A can do a piece of work in 15 days and B alone can do it in 10 days. B works at it for 5 days and then leaves. A alone can finish the remaining work in



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Correct Ans:7.5 days
Explanation:
B's 5 days work =
1/10∗5=1/2Remaining work =1−1/2=12A can finish work =15∗12=7.5days


5. A is thrice as good a workman as B and takes 10 days less to do a piece of work than B takes. B alone can do the whole work in



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Correct Ans:15 days
Explanation:
Ratio of times taken by A and B = 1:3
Means B will take 3 times which A will do in 1 time

If difference of time is 2 days, B takes 3 days
If difference of time is 10 days, B takes (3/2) * 10 =15 days


6. A does half as much work as B in three-fourth of the time. If together they take 18 days to complete the work, how much time shall B take to do it



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Correct Ans:30 days
Explanation:
(A+B)s 1 days work= 1/18
1/x + 2/3x = 1/18 or x = 30 days


7. To complete a work A and B takes 8 days, B and C takes 12 days, A,B and C takes 6 days. How much time A and C will take



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Correct Ans:8 days
Explanation:
A+B 1 day work = 1/8
B+C 1 day work = 1/12
A+B+C 1 day work = 1/6

We can get A work by (A+B+C)-(B+C)
And C by (A+B+C)-(A+B)

So A 1 day work =
1/6−1/12=1/12


Similarly C 1 day work =
1/6−1/8=4−3/24=1/24


So A and C 1 day work =

1/12+1/24=3/24=1/8


So A and C can together do this work in 8 days


8. A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?



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Correct Ans:15 days
Explanation:


9. A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :



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Correct Ans:8/15
Explanation:


10. A can finish a work in 18 days and B can do same work in half the time taken by A. then working together, what part of same work they can finish in a day



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Correct Ans:1/6
Explanation:
Please note in this question, we need to answer part of work for a day rather than complete work. It was worth mentioning here because many do mistake at this point in hurry to solve the question

So lets solve now,
A's 1 day work = 1/18
B's 1 day work = 1/9 [because B take half time than A]

(A+B)'s one day work =

(1/18+1/9)=(1+2/18)=1/6


11. A does a work in 10 days and B does the same work in 15 days. In how many days they together will do the same work ?



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Correct Ans:6 days
Explanation:


12. A and B can together complete a piece of work in 4 days. If A alone can complete the same work in 12 days, in how many days can B alone complete that work ?



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Correct Ans:6 days
Explanation:



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