police UP Police Jail Warder Mock Test Quantitative Aptitude Time and Work Pipe and Cistern

A pump can fill a tank in 5 hours, because of a leak it took 15 hours to completely fill the tank. In how much time the leak can empty a full tank? 

1
\(5\frac{1}{2}\) hours
2
\(7\frac{1}{2}\) hours
3
\(6\frac{1}{2}\) hours
4
\(8\frac{1}{2}\) hours
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