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1. |
A swimming pool is filled in 10 hours by three tankers A, B and C. The tanker C is twice as fast as B and B is twice as fast as A. How much time will tanker A alone take to fill the swimming pool? |
A. | 90 hours |
B. | 40 hours |
C. | 70 hours |
D. | 80 hours |
Answer» D. 80 hours | |