SSC NTA Delhi University Non-Teaching 2021 Mock Test Quantitative Aptitude Time and Work

A pump can fill a tank with water in 2 hours. Because of a leak, it took 18/5 hours to fill the tank. The leak can drain all the water of the tank in:

1
9/2 hours
2
7/2 hours
3
5 hours
4
4 hours
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