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A tank is filled by two pipes, A and B. Pipe A fills the tank in 4 hours, and Pipe B fills it in 12 hours. How long does it take for the tank to be filled if both pipes are open?
A tank is filled by two pipes, A and B. Pipe A fills the tank in 4 hours, and Pipe B fills it in 12 hours. How long does it take for the tank to be filled if both pipes are open?