A pipe can fill a tank in x hours and another pipe can empty it in y (y > x) hours. If both pipes are open, in how many hours will the tank is filled?

A pipe can fill a tank in x hours and another pipe can empty it in y (

1.	A pipe can fill a tank in x hours and another pipe can empty it in y (y > x) hours. If both pipes are open, in how many hours will the tank is filled?
A.	(x - y) hours
B.	(y - x) hours
C.	xy/x - y hours
D.	xy/y - x hours
Answer» E.

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A pipe can fill a tank in x hours and another pipe can empty it in y (y > x) hours. If both pipes are open, in how many hours will the tank is filled?

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