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40. Air circulation. In a room containing 20.000 ft of air, 600 ft of fresh air flows in per minute, and the mixture (made practically

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40. Air circulation. In a room containing 20.000 ft of air, 600 ft of fresh air flows in per minute, and the mixture (made practically uniform by circulating fans) is exhausted at a rate of 600 cubic feet per minute (cfm). What is the amount of fresh air y(i) at any time if y(0) = 0? After what time will 90% of the air be fresh

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