An insulated box with a partition is filled with air. On side 1 of the partition, the air is initially at a pressure of 6 bar and a temperature of 300 K. On side 2 of the partition, 1 kg of air is initially at a pressure of 1 bar and 600 K, occupying a volume that is 3 times that of side 1. If the partition is removed, determine the final equilibrium temperature of the air in the box. You can assume that the specific heats of the air on each side of the partition are constant and equal to each other.