The rms velocity $\left(u_{\mathrm{rms}}\right)$, mean velocity $\left(u_{\mathrm{av}}\right)$ and most probability ( $u_{\mathrm{mp}}$ ) of a gas differ from each other at a given temperature. Which of the following ratios regarding them is correct?

$60 \mathrm{~cm}^3$ of $\mathrm{SO}_2$ gas diffused through a porous membrane in ' $x$ ' min. Under similar conditions $360 \mathrm{~cm}^3$ of another gas (molar mass $4 \mathrm{~g} \mathrm{~mol}^{-1}$ ) diffused in ' $y$ ' $\min$. The ratio of $x$ and $y$ is

A 10 L vessel contains 1 mole of an ideal gas with pressure of $p(\mathrm{~atm})$ and temperature of $T(\mathrm{~K})$. The vessel is divided into two equal parts. The pressure (in atm) and temperature in (K) in each part is respectively.