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1. |
A pipe can fill a tank with water in 3 hours. Due to leakage in bottom, it takes $$3\frac{1}{2}$$ hours to fill it. In what time the leak will empty the completely filled tank? |
A. | 2 hours |
B. | 1 hours |
C. | $6\frac{1}{2}$$ hours |
D. | $10\frac{1}{2}$$ hours |
Answer» C. $6\frac{1}{2}$$ hours | |