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

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1.	A pipe can fill a tank in x hours and another pipe can empty it in y (y u003e 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» B. (y - x) hours

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