9. Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?
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A. 12 min. 30 sec.
B. 14 min. 40 sec.
C. 10 min. 20 sec.
D. 11 min. 45 sec.
