A pipe fills an empty fish pond in 16 hours, but an outlet at its base drains a full pond in 80 hours. If both are opened together on the empty pond, how many hours will it take to fill?

Question

Accepted Answer

20. Net filling rate = 1/16 − 1/80 = 5/80 − 1/80 = 4/80 = 1/20 of the pond per hour, so it fills in 20 hours.

A pipe fills an empty fish pond in 16 hours, but an outlet at its base drains a full pond in 80 hours. If both are opened together on the empty pond, how many hours will it take to fill?

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