A body moving horizontally on a smooth surface with a speed of 20 ms^-1 splits into two parts and continue to move in the same direction. The masses…

A body moving horizontally on a smooth surface with a speed of $\displaystyle 20 \mathrm{~ms}^{-1}$ splits into two parts and continue to move in the same direction. The masses of two parts are in the ratio of $\displaystyle 1: 2$. The smaller part moves with a speed of $\displaystyle 30 \mathrm{~ms}^{-1}$. The fractional change is the kinetic energy is given by $\displaystyle \frac{1}{x}$. The value of $\displaystyle x$ is \_\_\_\_