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A tank can be filled by pipe A in 6 hours and by pipe B in 4 hours. If pipe C can empty the tank in 12 hours, how long does it take to fill the tank if all three are open?
A tank can be filled by pipe A in 6 hours and by pipe B in 4 hours. If pipe C can empty the tank in 12 hours, how long does it take to fill the tank if all three are open?