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Pipe A fills a tank in 6 hours, and Pipe B fills it in 3 hours. How long to fill the tank together?
Pipe A fills a tank in 6 hours, and Pipe B fills it in 3 hours. How long to fill the tank together?
Pipe A fills a tank in 6 hours, and Pipe B fills it in 3 hours. How long to fill the tank together?