A pump can fill a tank with water in 3 hours. Due to leakage in the bottom, it takes \(3\frac{1}{2}\)hours to fill it. In what time the leak will empty the fully filled tank?

1
12 hours
2
21 hours
3
\(6\frac{1}{2}\) hours
4
\(10\frac{1}{2}\)hours

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