The amount of alcohol in the bloodstream, A, declines at a rate proportional to the amount, that is, $\frac { \mathrm { dA } } { \mathrm { dt } } = - \mathrm { kA }$.
If $\mathrm { k } = 0.6$ for a particular person, how long will it take for his alcohol concentration to decrease from $0.10 \%$ to $0.05 \%$ ? Give your answer to the nearest tenth of an hour.
A) 0.4 hr
B) 2.3 hr
C) 1.7 hr
D) 1.2 hr

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The Answer of The amount of alcohol in the bloodstream, A, declines at a rate proportional to the amount, that is, $\frac { \mathrm { dA } } { \mathrm { dt } } = - \mathrm { kA }$.
If $\mathrm { k } = 0.6$ for a particular person, how long will it take for his alcohol concentration to decrease from $0.10 \%$ to $0.05 \%$ ? Give your answer to the nearest tenth of an hour.
A) 0.4 hr
B) 2.3 hr
C) 1.7 hr
D) 1.2 hr

The Amount of Alcohol in the Bloodstream, A, Declines at a Rate