A hostel tank has two inlets that can fill it in 12 hours and 18 hours, and a drain that can empty it in 36 hours. If all three are opened together on the empty tank, how many hours will it take to fill?

Question

Accepted Answer

9. Net rate = 1/12 + 1/18 − 1/36 = 3/36 + 2/36 − 1/36 = 4/36 = 1/9 tank per hour, so 9 hours.

A hostel tank has two inlets that can fill it in 12 hours and 18 hours, and a drain that can empty it in 36 hours. If all three are opened together on the empty tank, how many hours will it take to fill?

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