A pipe can fill a tank in x hours and another can empty it in y hours. They can together fill it in (y > x) ?

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

1.	A pipe can fill a tank in x hours and another can empty it in y hours. They can together fill it in (y > x) ?
A.	(x - y) hours
B.	(y - x ) hours
C.	xy / (x - y) hours
D.	xy / ( y - x) hours
Answer» E.

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