Two pipes A and B can fill a cistern in 12 and 15 minutes respectively. Both are opened together but after 3 minutes A is turned off. After how much more time will the cistern be filled?

Two pipes A and B can fill a cistern in 12 and 15 minutes respectivel

1.	Two pipes A and B can fill a cistern in 12 and 15 minutes respectively. Both are opened together but after 3 minutes A is turned off. After how much more time will the cistern be filled?
A.	3 1/4 min
B.	5 1/4 min
C.	8 1/4 min
D.	9 1/4 min
Answer» D. 9 1/4 min

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Two pipes A and B can fill a cistern in 12 and 15 minutes respectively. Both are opened together but after 3 minutes A is turned off. After how much more time will the cistern be filled?

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