state gov KPSC Group C Mock Test 2022 Quantitative Aptitude Time and Work Pipe and Cistern

Two pipes A and B can fill a tank in 12 and 24 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?

1
6 min.
2
4 min.
3
9 min.
4
8 min.
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