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 (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

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