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1. |
Working together, pipes A and B can fill an empty tank in 10 hours. They worked together for 4 hours and then B stopped and A continued filling the tank till it was full. It took a total of 13 hours to fill the tank. How long would it take A to fill the empty tank alone? |
A. | 15 hours |
B. | 13 hours |
C. | 16 hours |
D. | 12 hours |
Answer» B. 13 hours | |