A borewell pump fills a rooftop tank in 11 hours, but a cracked valve can drain the full tank in 22 hours. If the pump runs with the valve leaking, how many hours does the empty tank take to fill?

Question

Accepted Answer

22. Net rate = 1/11 − 1/22 = 2/22 − 1/22 = 1/22 tank per hour, so the tank fills in 22 hours.

A borewell pump fills a rooftop tank in 11 hours, but a cracked valve can drain the full tank in 22 hours. If the pump runs with the valve leaking, how many hours does the empty tank take to fill?

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