Pipe X can fill a tank in 12 hours and pipe Y can fill the same tank in 36 hours. In how many hours both pipe X and pipe Y together can fill one-third part of the tank?

Pipe X can fill a tank in 12 hours and pipe Y can fill the same tank i

1.	Pipe X can fill a tank in 12 hours and pipe Y can fill the same tank in 36 hours. In how many hours both pipe X and pipe Y together can fill one-third part of the tank?
A.	9 hours
B.	3 hours
C.	15 hours
D.	27 hours
Answer» C. 15 hours

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Pipe X can fill a tank in 12 hours and pipe Y can fill the same tank in 36 hours. In how many hours both pipe X and pipe Y together can fill one-third part of the tank?

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