An executive conference room of a corporation contains 4500 ft3 of air initially free of car-bon monoxide. Starting at time t = 0, cigarette smoke contain-ing 4% carbon monoxide is blown into the room at the rate of 0.3 ft3/min. A ceiling fan keeps the air in the room well circu-lated and the air leaves the room at the same rate of 0.3 ft3/min. Find the time when the concentration of carbon monoxide in the room reaches 0.01%.

Question

An executive conference room of a corporation contains 4500 ft3 of air initially free of car-bon monoxide. Starting at time t = 0, cigarette smoke contain-ing 4% carbon monoxide is blown into the room at the rate of 0.3 ft3/min. A ceiling fan keeps the air in the room well circu-lated and the air leaves the room at the same rate of 0.3 ft3/min. Find the time when the concentration of carbon monoxide in the room reaches 0.01%.

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