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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 ? | |
A. | 10 min 20 sec [Wrong Answer] |
B. | 11 min 45 sec [Wrong Answer] |
C. | 12 min 30 sec [Wrong Answer] |
D. | 14 min 40 sec [Correct Answer] |