Pipe P can fill a tank alone in 7 hours. Pipe Q can fill the same tank alone in 13 hours. In how much time can they together fill the tank?

Pipe P can fill a tank alone in 7 hours. Pipe Q can fill the same tank

1.	Pipe P can fill a tank alone in 7 hours. Pipe Q can fill the same tank alone in 13 hours. In how much time can they together fill the tank?
A.	3 hours 18 minutes
B.	4 hours 33 minutes
C.	3 hours 45 minutes
D.	4 hours 12 minutes
Answer» C. 3 hours 45 minutes

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Pipe P can fill a tank alone in 7 hours. Pipe Q can fill the same tank alone in 13 hours. In how much time can they together fill the tank?

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