The root mean square speed of gas molecules at 25K and 1.5×${10}^5$ ${\mathrm{Nm}}^{-2}$ is 100.5 ${\mathrm{ms}}^{-1}$. If the temperature is raised to 100 K and pressure to 6.0 × ${10}^5$ ${\mathrm{Nm}}^{-2}$, the root mean square speed becomes.