If the rate constant of a reaction is 0.03 s^-1, how much time does it take for 7.2 mol L^-1 concentration of the reactant to get reduced to 0.9 mol…

If the rate constant of a reaction is $\displaystyle 0.03 \mathrm{~s}^{-1}$, how much time does it take for $\displaystyle 7.2 \mathrm{~mol} \mathrm{~L}^{-1}$ concentration of the reactant to get reduced to $\displaystyle 0.9 \mathrm{~mol} \mathrm{~L}^{-1}$ ? (Given: $\displaystyle \log 2=0.301$ )