A vessel has three pipes connected to it , two to supply liquid and one to draw liquid. The first alone can fill the vessel in 41/2 hours, the second in 3 hours and the third can empty it in 11/2 hours. If all the pipes are opened simultaneously when the vessel is half full, how soon will it be emptied?

A vessel has three pipes connected to it , two to supply liquid and on

1.	A vessel has three pipes connected to it , two to supply liquid and one to draw liquid. The first alone can fill the vessel in 41/2 hours, the second in 3 hours and the third can empty it in 11/2 hours. If all the pipes are opened simultaneously when the vessel is half full, how soon will it be emptied?
A.	41/2
B.	51/2
C.	61/2
D.	None of these
Answer» B. 51/2

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