X can do a work in 16 days. In how many days will the work be completed by Y, if the efficiency of Y is 60% more than that of X?

10 days
12 days
25 days
30 days

Correct Answer: 10 days

Explanation:

Ratio of time taken by X
and Y = 160 : 100 = 16 : 1
Suppose Y takes y days to the work.
Then, 1.6 : 1 = 16 : y
∴ y = (16 x 1)/1.6 = 10 days

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