Two pipes A and B can alone fill a tank in 20 minutes and 30 minutes respectively But due to a leak ...........

Quantitative Aptitude ( CCS) Pipes&cistern

Two pipes A and B can alone fill a tank in 20 minutes and 30 minutes respectively. But due to a leak at the bottom of tank, it took 3 more minutes to fill the tank. In how many hours, the leak can alone empty the full tank?

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Explanation:

Answer & Explanation
60
Explanation:
A and B can fill tank in (1/20 + 1/30) = 1/12 so 12 minutes
But it took 3 more minutes, this means the tank got full in 12+3 = 15 minutes
So (1/20 + 1/30 – 1/x) = 1/15
Solve, x = 60