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

$\left( {\frac{{xy}}{{x - y}}} \right)\,{\text{hours}}$$

$\left( {\frac{{xy}}{{y - x}}} \right){\text{hours}}$$

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. In how many hours they together fill it in ( y > x) ?
A.	x - y) hours
B.	y - x) hours
C.	$\left( {\frac{{xy}}{{x - y}}} \right)\,{\text{hours}}$$
D.	$\left( {\frac{{xy}}{{y - x}}} \right){\text{hours}}$$
Answer» E.

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