Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate hours and if pipe A is opened first, in how many hours, the tank shall be full?

Two pipes A and B can fill a tank in 6 hours and 4 hours respectively.

1.	Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate hours and if pipe A is opened first, in how many hours, the tank shall be full?
A.	4
B.	\[4\frac{1}{2}\]
C.	5
D.	\[5\frac{1}{2}\]
Answer» D. \[5\frac{1}{2}\]

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Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate hours and if pipe A is opened first, in how many hours, the tank shall be full?

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