A mixture of 2 moles of helium gas (atomic mass $= 4 \mathrm { u }$), and 1 mole of argon gas (atomic mass $= 40 \mathrm { u }$) is kept at 300 K in a container. The ratio of their rms speeds $\frac { V _ { \text {rms} } (\text{helium}) } { V _ { \text {rms} } (\text{argon}) }$, is close to:\\
(1) 0.45\\
(2) 2.24\\
(3) 0.32\\
(4) 3.16