A mixture of 2 moles of helium gas (atomic mass= 4 u), and 1 mole of argon gas (atomic mass= 40 u) is kept at 300 K in a container. The ratio of their rms speed $\left[\frac{{\text{V}}_{\text{rms}}\left(\text{helium}\right)}{{\text{V}}_{\text{rms}}\left(\text{argon}\right)}\right]$, is close to: