Two pipes can fill a tank in 20 hours and 30 hours respectively. The pipes are opened simultaneously and it is found that due to leakage in bottom of it took 1 hour more to fill the tank. When tank is full, in what time the leak will empty it?

Options
- 150 hours
- 160 hours
- 156 hours
- 154 hours

CORRECT ANSWER : 156 hours

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