Pipes P and Q can fill a tank in 12 hours and 36 hours respectively. If both pipes are opened then, how much time (in hours) it will take to fill the tank?

Pipes P and Q can fill a tank in 12 hours and 36 hours respectively. I

1.	Pipes P and Q can fill a tank in 12 hours and 36 hours respectively. If both pipes are opened then, how much time (in hours) it will take to fill the tank?
A.	9
B.	8
C.	10
D.	7
Answer» B. 8

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Pipes P and Q can fill a tank in 12 hours and 36 hours respectively. If both pipes are opened then, how much time (in hours) it will take to fill the tank?

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