Suppose that three parameters of a gas: Pressure P, volume V, and temperature T at all times t are related by the equation where a = 6 kPa litres/kelvin is a constant. Suppose that we start decreasing the pressure at a rate of 6 kPa/min and increase the temperature at a rate of 6 kelvin/min. How quickly is the volume changing when the temperature reaches 320 kelvin and the presure at the moment is 300 kPa? The volume is changing at a rate of = PV =oT, litres/min.

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