E-PolyLearning

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

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

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

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

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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