Two pipes A and B can fill a tank in 12 minutes and 15 minutes respectively. if both the pipes are opened simultaneously and pipe A is closed after 3 minutes, then how much more time will it take to fill the tank by pipe B .. ?

Two pipes A and B can fill a tank in 12 minutes and 15 minutes respect

1.	Two pipes A and B can fill a tank in 12 minutes and 15 minutes respectively. if both the pipes are opened simultaneously and pipe A is closed after 3 minutes, then how much more time will it take to fill the tank by pipe B .. ?
A.	7 min 15 sec
B.	7 min 45 sec
C.	8 min 5 sec
D.	8 min 15 sec
Answer» E.

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Two pipes A and B can fill a tank in 12 minutes and 15 minutes respectively. if both the pipes are opened simultaneously and pipe A is closed after 3 minutes, then how much more time will it take to fill the tank by pipe B .. ?

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