Consider the following reaction: $A \longrightarrow \text{Products}$. This reaction is completed in $100 \ min$. The rate constant of this reaction at $t_1 = 10 \ min$ is $10^{-2} \ min^{-1}$. What is the rate constant (in $min^{-1}$) at $t_2 = 20 \ min$?
- A$2 \times 10^{-2}$
- B$10^{-2}$
- C$5 \times 10^{-3}$
- D$0.1$
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