Chemical Kinetics And Nuclear Chemistry

\(\text { For a first order reaction } \mathrm{A} \rightarrow \mathrm{~B}\)

$$ \begin{array}{|l|l|} \hline \mathrm{t} / \min & {[\mathrm{A}] / \mathrm{M}} \\ \hline 0 & 0.6500 \\ \hline x & 0.0650 \\ \hline 20 & 0.00065 \\ \hline \end{array} $$

$x=$ $\_\_\_\_$ min. (Nearest integer)