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? | MCQ Hive

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Q 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 A. 3 1/4 min
B B. 5 1/4 min
C C. 8 1/4 min
D D. 9 1/4 min

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