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A pool has two pipes. Pipe A can fill the pool in 4 hours, and Pipe B can fill the same pool in 12 hours. If both pipes are opened at the same time, how many hours will it take to fill the pool?
A pool has two pipes. Pipe A can fill the pool in 4 hours, and Pipe B can fill the same pool in 12 hours. If both pipes are opened at the same time, how many hours will it take to fill the pool?