- Speed, Distance, and Time, Unit Conversions (Feet to inches, miles to feet, hours to seconds)Choice C
$$ Speed = \frac{{Distance}}{{Time}}=\frac{60.5 \ feet }{0.5 \ second}=\frac{60.5 \div 5280\ miles }{0.5 \div 3600 \ hour }=82.5 $$

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