\left\{ \begin{array} { l } { 0.05 = e ^ { - k e \cdot 6 } } \\ { 0.05 \times 2 = e ^ { - k e \cdot t } } \end{array} \right.
Solve for k, t
t=-\frac{\ln(10)}{et_{1744830465}}
k=\frac{\ln(20)}{6e}
t_{1744830465}\neq 0
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