Chemical Kinetics

Rate law for the reaction,

\(\mathrm{NO}_{2(\mathrm{~g})}+\mathrm{CO}_{(\mathrm{g})} \longrightarrow \mathrm{NO}_{(\mathrm{g})}+\mathrm{CO}_{2(\mathrm{~g})}\)

is as $\mathrm{R}=\mathrm{k}\left[\mathrm{NO}_2\right]^2$. What is the order of reaction w.r.t. CO ?