Pipe A can fill the tank in 60 minutes while Pipe B does it in 40 minutes. If the tank is empty and Pipe B is opened for the first half while both Pipe A and B are opened for the second half, how long will it take to fill the empty tank?

Pipe A can fill the tank in 60 minutes while Pipe B does it in 40 min

1.	Pipe A can fill the tank in 60 minutes while Pipe B does it in 40 minutes. If the tank is empty and Pipe B is opened for the first half while both Pipe A and B are opened for the second half, how long will it take to fill the empty tank?
A.	15 minutes
B.	20 minutes
C.	27.5 minutes
D.	30 minutes
Answer» E.

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Pipe A can fill the tank in 60 minutes while Pipe B does it in 40 minutes. If the tank is empty and Pipe B is opened for the first half while both Pipe A and B are opened for the second half, how long will it take to fill the empty tank?

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