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

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

1.	A pipe can fill a tank in x hours and an another can empty it in y hours. In how many hours will they together fill it. If y>x?
A.	$$ {xy over y-x}{hrs}$$
B.	$$ {y-x over xy}{hrs}$$
C.	$$ {2yx over y-x}{ hs}$$
D.	Can t be determined
Answer» B. $$ {y-x over xy}{hrs}$$

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

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