A 10,000-cu-ft room contains 20% carbon dioxide. Pure oxygen will be pumped into the room at a rate of 5 cu ft/min. The well-mixed air escapes from the room at a rate of 5 cu ft/min.
a) How long will it take to reduce the carbon-dioxide level to 5%?
b) How long will it take to reduce the carbon-dioxide level to 5% if smokers are putting in carbon dioxide at a rate of 1 cu ft/min?
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