Two pipes A and B can fill a tank in 15 min and 20 min respectively. Both the pipes are opened together but after 4 min, pipe A is turned off. What is the total time required to fill the tank? | MCQ Hive

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Q Two pipes A and B can fill a tank in 15 min and 20 min respectively. Both the pipes are opened together but after 4 min, pipe A is turned off. What is the total time required to fill the tank?

A A. 10 min 20 sec
B B. 11 min 45 sec
C C. 12 min 30 sec
D D. 14 min 40 sec

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