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

MCQOPTIONS

1.	A pipe can fill a tank in x hours and another can empty it in y hours. They can together fill it in (yu003ex)
A.	xy/x-y
B.	y - x
C.	x - y
D.	xy/y-x
Answer» E.

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