For a first order reaction,the concentration of reactant was reduced from $0.03 \ mol \ L^{-1}$ to $0.02 \ mol \ L^{-1}$ in $25 \ min$. What is its rate (in $mol \ L^{-1} \ s^{-1}$)?
- A$6.667 \times 10^{-6}$
- B$4 \times 10^{-4}$
- C$6.667 \times 10^{-4}$
- D$4 \times 10^{-6}$
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