The air in a meeting room of 15,000 ft 3 has a smoke content of 20 parts

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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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