An inlet fills an empty overhead tank in Coimbatore in 4 hours, while a leaky valve can empty the full tank in 36 hours. With both working, after how many hours is the tank full?

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Accepted Answer

4.5. Net rate = 1/4 − 1/36 = (9 − 1)/36 = 8/36 = 2/9 tank per hour, so it fills in 9/2 = 4.5 hours.

An inlet fills an empty overhead tank in Coimbatore in 4 hours, while a leaky valve can empty the full tank in 36 hours. With both working, after how many hours is the tank full?

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