A school's overhead tank is fed by two taps. The first tap alone fills it in 42 minutes and the second alone in 56 minutes. With both taps open, how many minutes does filling take?

Question

Accepted Answer

24. Combined rate = 1/42 + 1/56 = 4/168 + 3/168 = 7/168 = 1/24 tank per minute, so the tank fills in 24 minutes.

A school's overhead tank is fed by two taps. The first tap alone fills it in 42 minutes and the second alone in 56 minutes. With both taps open, how many minutes does filling take?

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