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A pool has two pipes. Pipe A fills it in 5 hours, Pipe B in 10 hours, and Pipe C empties it in 20 hours. How long to fill the pool with all three open?
A pool has two pipes. Pipe A fills it in 5 hours, Pipe B in 10 hours, and Pipe C empties it in 20 hours. How long to fill the pool with all three open?