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1. |
Pipes A and B, when working together can fill an empty tank in 24 hours. They work together for 8 hours and then B is stopped but A continued to work. It took a total of 28 hours to fill the tank. How long would it take A to fill the empty tank alone? |
A. | 30 hours |
B. | 29 hours |
C. | 28 hours |
D. | 31 hours |
Answer» B. 29 hours | |