Tap A can fill a tank in 6 hours, tap B can fill the same tank in 8 hours and tap C can empty the same tank in 4 hours. If all three taps A, B and C are opened together, then how much time (in hours) will be taken to fill the tank?
A. 24
B. 30
C. 28
D. 20
Answer: Option A
This Question Belongs to Arithmetic Ability >> Pipes And Cistern
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