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 fully filled tank

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 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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