Mathematics, 26.07.2019 12:50 dillon100097
3pumps, working 8 hours a day, can empty a tank in 2 days. how many hours a day must 4 pumps work to empty the tank in 1 day?
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3pumps, working 8 hours a day, can empty a tank in 2 days. how many hours a day must 4 pumps work to...
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