(Air circulation) In a room containing 20000 ft3 of air,

Chapter 1, Problem 38

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(Air circulation) In a room containing 20000 ft3 of air, 600 ft3 of fresh air tlows in per minute, and the mixture (made practically unifonn by circulating fans) is exhausted at a rate of 600 cubic feet per minute (cfm). What is the amount of fresh air Yl1) at any time if yeO) = 0'1 After what time will 90% of the air be fresh?

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