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1. |
Three pipes A, B and C when opened simultaneously can fill a tank in 6 hours. C is closed after 2 hours while A and B fill the remaining tank in 7 hours. How long will C take to fill the tank alone? |
A. | 10 hours |
B. | 12 hours |
C. | 13 hours |
D. | 14 hours |
Answer» E. | |