A pipe can fill a tank in x hours and another pipe can empty it in y (y > x) hours. If both the pipes are open, in how many hours will the tank be 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 the pipes are open, in how many hours will the tank be filled ?
A.	(x y) hours
B.	(y x) hours
C.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>xy</center></td><td rowspan="2">hours</td></tr><tr><td style="text-align: center;">x - y</td></tr></table>
D.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>xy</center></td><td rowspan="2">hours</td></tr><tr><td style="text-align: center;">y - x</td></tr></table>
Answer» E.

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