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A pool has three pipes. Pipe A can fill it in 6 hours, Pipe B in 4 hours, and Pipe C can drain it in 12 hours. How long will it take to fill the empty pool if all three are open?
A pool has three pipes. Pipe A can fill it in 6 hours, Pipe B in 4 hours, and Pipe C can drain it in 12 hours. How long will it take to fill the empty pool if all three are open?