The rate constant for a first order reaction is 20 min^-1. The time required for the initial concentration of the reactant to reduce to its 1/32…

The rate constant for a first order reaction is $\displaystyle 20 \mathrm{~min}^{-1}$. The time required for the initial concentration of the reactant to reduce to its $\displaystyle \frac{1}{32}$ level is $\displaystyle \_\_\_\_$ $\displaystyle \times 10^{-2} \mathrm{~min}$. (Nearest integer) (Given : $\displaystyle \ln 10=2.303$ $$\log 2=0.3010) $$