WBJEE 2014 Chemistry Solved Paper

Two gases X (Mol. Wt. Mx) and Y(Mol. Wt. MY ; MY > Mx) are at the same temperature T in two different containers.Their root mean square velocities are CX and CY respectively. If the average kinetic energies per molecule of two gasesX and Y are Ex and EY respectively, then which of the following relation (s) is (are) true?