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Final answer:Based on the given flow rates, the factory used an estimated total of 570 cubic meters of water between 6 am and 9 am.Explanation:The problem requires you to calculate the totalvolumeof water used by the factory between 6 am and 9 am. As we know, the flow rate increased steadily from 100 m3/hr at 6 am to 280 m3/hr at 9 am. This indicates a linear increase in the flow rate.Therefore, we can consider theaverage flow rateduring this time, which is the sum of the initial and final rates divided by 2. Hence, the average flow rate is (100 m3/hr + 280 m3/hr) / 2 = 190 m3/hr.To find the total volume of water used, we multiply the average rate by the total time in hours. So, between 6 am and 9 am, a duration of 3 hours, the volume of water used is 190 m3/hr x 3 hr = 570 m3.So, we estimate that the factory used a total volume of 570cubic metersof water between 6 am and 9 am.Learn more about Flow Rate here:brainly.com/question/33722549#SPJ11...