Teaching OSSC TGT Teachers Mock Test 2023 Quantitative Aptitude Time and Work Pipe and Cistern

Tap P can fill a cistern in 6 hours and tap Q can empty the full cistern in 10 hours. If both taps P and Q are kept open simultaneously, then in how many hours will the empty cistern be completely full ?

1
15
2
18
3
12
4
16
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