# Aptitude - Time and Work

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### Exercise

"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."
- Albert Einstein
1.

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 :

A.

 1 4

B.

 1 10

C.

 7 15

D.

 8 15

2.

A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in:

A.

 9 1 days 5

B.

 9 2 days 5

C.

 9 3 days 5

D. 10

3.

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?

 A. 12 days B. 15 days C. 16 days D. 18 days

4.

A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:

A. 20 daysB.
 22 1 days 2
C. 25 daysD. 30 days

5.

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?

 A. Rs. 375 B. Rs. 400 C. Rs. 600 D. Rs. 800