A tap alone fills a sump in 11 hours, but because of a leak the sump takes 13 hours to fill. How many hours would the leak take to empty the full sump?

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Accepted Answer

71.5. Leak rate = 1/11 − 1/13 = 13/143 − 11/143 = 2/143 of the sump per hour, so the leak empties it in 143/2 = 71.5 hours.

A tap alone fills a sump in 11 hours, but because of a leak the sump takes 13 hours to fill. How many hours would the leak take to empty the full sump?

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