Pipe A and pipe B can fill up a tank in 40 min and 80 min respectively. Both the pipes are opened simultaneously for some time and pipe B is closed. If the total time to fill up the tank is 30 minutes, then how long the pipe B was open for?

Pipe A and pipe B can fill up a tank in 40 min and 80 min respectively

1.	Pipe A and pipe B can fill up a tank in 40 min and 80 min respectively. Both the pipes are opened simultaneously for some time and pipe B is closed. If the total time to fill up the tank is 30 minutes, then how long the pipe B was open for?
A.	5 min
B.	10 min
C.	15 min
D.	20 min
Answer» E.

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Pipe A and pipe B can fill up a tank in 40 min and 80 min respectively. Both the pipes are opened simultaneously for some time and pipe B is closed. If the total time to fill up the tank is 30 minutes, then how long the pipe B was open for?

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