An inlet pipe can fill a tank in 12 hours, while an outlet pipe can empty the full tank in 15 hours. If both are opened together on an empty tank, in how many hours will it be filled?

Question

Accepted Answer

60. Net filling rate = 1/12 − 1/15 = 5/60 − 4/60 = 1/60 tank per hour, so the tank fills in 60 hours.

An inlet pipe can fill a tank in 12 hours, while an outlet pipe can empty the full tank in 15 hours. If both are opened together on an empty tank, in how many hours will it be filled?

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