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A pool is filled by Pipe A in 4 hours, Pipe B in 6 hours, and drained by Pipe C in 12 hours. If all three operate simultaneously, how many hours does it take to fill the pool?
A pool is filled by Pipe A in 4 hours, Pipe B in 6 hours, and drained by Pipe C in 12 hours. If all three operate simultaneously, how many hours does it take to fill the pool?