Pipe A takes 4 hours to fill a tank. Pipe B takes 6 hours to empty the same tank when full. If both thepipes are opened at the same time when the tank is empty, how many hours will it take for the tank toÂ fill?_x005F_x000D_

Pipe A takes 4 hours to fill a tank. Pipe B takes 6 hours to empty the

1.	Pipe A takes 4 hours to fill a tank. Pipe B takes 6 hours to empty the same tank when full. If both thepipes are opened at the same time when the tank is empty, how many hours will it take for the tank toÂ fill?_x005F_x000D_
A.	10
B.	8
C.	12
D.	15
Answer» D. 15

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