state gov BPSC LDC Mock Test 2021 Quantitative Aptitude Time and Work Pipe and Cistern

Pipe P and Q can fill a tank in 15 hours and 30 hours respectively and an outlet pipe can empty a tank in 20 hours. In how much time will the tank be filled if they are opened together.

1
10 hours
2
15 hours
3
25 hours
4
20 hours
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