Answer
$\approx80.39$ mph
Work Step by Step
Plugging in $B=12$ into the formula we get: $12=1.69\sqrt{s+4.25}-3.55\\15.55=1.69\sqrt{s+4.25}\\9.2\approx \sqrt{s+4.25}\\84.64\approx s+4.25\\s\approx80.39$
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