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

Pipe A can fill a tank in 4 hours and pipe B can fill it in 6 hours. I

1.	Pipe A can fill a tank in 4 hours and pipe B can fill it in 6 hours. If they are opened on alternate hours and if pipe A is opened first then in how many hours, the tank shall be full?
A.	$$3{1 over 2} hrs$$
B.	$$3{1 over 4} hrs$$
C.	$$4{1 over 2} hrs$$
D.	$$4{2 over 3} hrs$$
Answer» E.

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

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