One fourth of a tank can be filled in 3 hours by pipe A and one-third of the same tank can be filled in 2 hours by pipe B. How long will it take for the tank to be filled if both the pipes are kept open?

One fourth of a tank can be filled in 3 hours by pipe A and one-third

1.	One fourth of a tank can be filled in 3 hours by pipe A and one-third of the same tank can be filled in 2 hours by pipe B. How long will it take for the tank to be filled if both the pipes are kept open?
A.	5 h
B.	2 h
C.	4 h
D.	\(2\frac{1}{2}{\rm{h}}\)
Answer» D. \(2\frac{1}{2}{\rm{h}}\)

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One fourth of a tank can be filled in 3 hours by pipe A and one-third of the same tank can be filled in 2 hours by pipe B. How long will it take for the tank to be filled if both the pipes are kept open?

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