Question: In Exercise 62, how long will it take to reduce the smoke content to 10 ppm if smokers in the room are adding smoke at

In Exercise 62, how long will it take to reduce the smoke content to 10 ppm if smokers in the room are adding smoke at the rate of 5 ppm per minute?

Exercise 62

The air in a meeting room of 15,000 ft³ has a smoke content of 20 parts per million (ppm). An air conditioner is turned on, which brings fresh air (with no smoke) into the room at a rate of 1200 ft³ per minute and forces the smoky air out at the same rate. How long will it take to reduce the smoke content to 5 ppm?

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