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Question
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?
Options:
A .  12 hours
B .  21 hours
C .  $$6\frac{1}{2}$$ hours
D .  $$10\frac{1}{2}$$ hours
Answer: Option B

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