Pipe A fills 8% of a tank every hour and pipe B empties 3% of it every hour. The tank is 35% full when both are opened. After how many hours will it be 90% full?

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Accepted Answer

11 h. Net =8-3=5\% per hour. Needed 90-35=55\% → 55/5=11 h. (18 h starts from empty; 6.875 h ignores B.)

Pipe A fills 8% of a tank every hour and pipe B empties 3% of it every hour. The tank is 35% full when both are opened. After how many hours will it be 90% full?

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