#254 A tank of 25×25×8 m3 contains air with

A tank of 25×25×8 m3 contains air with - Math

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A tank of 25×25×8 m3 contains air with 0.16% CO2 initially. We start pumping fresh air with 0.04% CO2 into the tank with a constant rate of v m3 /min. In the meantime, the uniformly mixed air in the tank also flows out of the tank with the same rate.

(a) If we want the air in the tank to contain no more than 0.08% CO2 after pumping fresh air for 50 minutes, what is the required rate of pumping fresh air into the tank?

(b) Using the pumping rate obtained in (a) to keep pumping fresh air with 0.04% CO2 into the tank, if we want the air in the tank to contain no more than 0.06% CO2, how long does the pumping need to continue?

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