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