Chapter 14, Problem 30QP

The rate constant for the second-order reaction:

${\text{2NO}}_{\text{2}}\left(g\right)\to \text{2NO}\left(g\right){\text{ + O}}_{\text{2}}\left(g\right)$

is $\text{0}\text{.54/}M\cdot \text{ s at 300°C}$. How long (in seconds) would it take for the concentration of ${\text{NO}}_{\text{2}}$ to decrease from $\text{0}\text{.65 }M\text{ to 0}\text{.18 }M$ ?