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1. |
Pipes A and B fill a tank in 5 and 6 hours respectively. Pipe C empties the tank in 12 hours, if you open all the three pipes together this tank will be filled in? |
A. | 3 9/17 hours |
B. | 4.5 hours |
C. | 1.25 hours |
D. | 4 7/17 hours |
Answer» B. 4.5 hours | |