Mathematics, 18.08.2019 14:00 josecano2

3pumps, working 6 hours a day, can empy a water tank in 2 days. how many hours a day must 9 pumps work to empty the same tank in 1 day?

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3pumps, working 6 hours a day, can empy a water tank in 2 days. how many hours a day must 9 pumps wo...