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1. |
Pipes A and B are emptying pipes and can empty a tank in 6 hours and 16 hours, respectively. C is a filling pipe. All three pipes were opened together. They took 80 minutes to empty 5/18th of the tank. Pipe C alone can fill the tank in: |
A. | 36 hours |
B. | 42 hours |
C. | 48 hours |
D. | 40 hours |
Answer» D. 40 hours | |