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Ordinary Differential Equations, Tenenbaum & Pollard, Exercise 15A, Problem 12: The CO2 content of the air...

Ordinary Differential Equations, Tenenbaum & Pollard, Exercise 15A, Problem 12:

The CO2 content of the air in a 7200-cu-ft room is 0.2 percent. What volume of fresh air containing 0.05 percent CO2 must be pumped into the room each minute in order to reduce the CO2 content to 0.1 percent in 15 min?

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