A man wants to work on his automobile in his garage on a winter day. Having no heating system in the garage, he runs the automobile in the closed building to heat it.At idle speed, the engine burns 5...

A man wants to work on his automobile in his garage on a winter day. Having no heating system in the garage, he runs the automobile in the closed building to heat it.At idle speed, the engine burns 5 lbm of stoichiometric gasoline per hour, with 0.6% of the exhaust being carbon monoxide. The inside dimensions of the garage are 20 ft by 20 ft by 8 ft, and the temperature is 40°F. It can be assumed that 10 parts per million (ppm) of CO in the air is dangerous to health. Calculate the time to when the CO concentration in the garage is dangerous. [min]