As shown in the figure attached, an insulated box is initially divided into halves by a frictionless, thermally conducting piston. On one side of the piston is 1.5 m^3 of air at 400 K, 4 bar. On the other side is 1.5 m^3 of air at 400 K, 2 bar. The piston is released and equilibrium is attained, with the piston experiencing no change of state. Employing the ideal gas model for the air, determine: a) the final temperature, in K. b) the final pressure, in bar. The answer provided by my professor for temperature is 400 K, and the final pressure, 3 bar. I would like to know how is this problem solved?