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$12/03/248$:$56$ AM

Question $39,$

$13\mathrm{.}3\mathrm{.}37$

HW Score: $76$ : $34\%$

Part $2$ of $3$

Points: $0\mathrm{.}75$ of $1$

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A car was driving on a two$-$lane highway at $85$ feet per second $($about $58$ mph $)$ when it abruptly speeds up to pass a slow$-$moving truck. The velocity of the car $($in $f\frac{t}{sec})$ after t seconds is given by $v(t)=85+5t{e}^{-\frac{t}{4}}$ for