Capacity of tap Y is 60% more than that of X. If both the taps are opened simultaneously, they take 40 hours to fill the rank. The time taken by Y alone to fill the tank is
Explanation:
Tap X does a units of work in 1 hour.
∴ Tap Y does 1.6a units of work in 1 hour.
∴ In 1 hour Tap X and Y together do 2.6a units of work.
∴ Work done by Tap X and Y in 40 hours = 2.6a × 40
∴ Time taken by Tap Y alone to do this work
= 2.6a×401.6a = 65 hours
Hence, option (b).
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