A garden water tank fills through its pipe in 15 hours, but a hole at the bottom would empty it in 40 hours. With both acting, how many hours does the empty tank take to fill?

Question

Accepted Answer

24. Net rate = 1/15 − 1/40 = 8/120 − 3/120 = 5/120 = 1/24 per hour, so the tank fills in 24 hours.

A garden water tank fills through its pipe in 15 hours, but a hole at the bottom would empty it in 40 hours. With both acting, how many hours does the empty tank take to fill?

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