Two cylinders A and B, fitted with pistons, contain equal amount of an ideal diatomic gas at 300K. The piston of A is free to move, while that of B...

Two cylinders A and B, fitted with pistons, contain equal amount of an ideal diatomic gas at 300K. The piston of A is free to move, while that of B is held fixed. The same amount of heat is given to the gas in each cylinder. If the rise in temperature of gas in A is 30 K the find the rise in temperature of gas B?