engineering recuitment NPCIL Plant Operator Mock Test Quantitative Aptitude Time and Work

If two taps A and B can fill a tank in 8 minutes and 48 minutes and a tap C can empty the tank in 12 minutes. Find the time taken to fill the tank completely if all the taps are opened together?

1
15 minutes
2
18 minutes
3
20 minutes
4
16 minutes
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