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.	<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>
B.	x y hours
C.	y x hours
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;">x - y</td></tr></table>
Answer» B. x y hours

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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)

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