| 16. | X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last? |
| a. | 6 days |
| b. | 10 days |
| c. | 15 days |
| d. | 20 days |
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Answer: (b).10 days
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| 17. | A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days? |
| a. | 11 days |
| b. | 13 days |
| c. | 20(3/17) days |
| d. | None of these |
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Answer: (b).13 days
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| 18. | Ravi and Kumar are working on an assignment. Ravi takes 6 hours to type 32 pages on a computer, while Kumar takes 5 hours to type 40 pages. How much time will they take, working together on two different computers to type an assignment of 110 pages? |
| a. | 7 hours 30 minutes |
| b. | 8 hours |
| c. | 8 hours 15 minutes |
| d. | 8 hours 25 minutes |
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Answer: (c).8 hours 15 minutes
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| 19. | A, B and C can complete a piece of work in 24, 6 and 12 days respectively. Working together, they will complete the same work in: |
| a. | 1/24 day |
| b. | 7/24 day |
| c. | 3(3/7) days |
| d. | 4 days |
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Answer: (c).3(3/7) days
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| 20. | Sakshi can do a piece of work in 20 days. Tanya is 25% more efficient than Sakshi. The number of days taken by Tanya to do the same piece of work is: |
| a. | 15 |
| b. | 16 |
| c. | 18 |
| d. | 25 |
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Answer: (b).16
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