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1. |
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. | 15 min 20 sec. |
B. | 16 min 40 sec. |
C. | 13 min 10 sec. |
D. | 14 min 40 sec. |
Answer» E. | |