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61ft//sec=
mph

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$61 \mathrm{ft} / \mathrm{sec}=$ $\mathrm{mph}$ $\newline$ > Next Question

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Mixed customary units

Full solution

Q.

61 \mathrm{ft} / \mathrm{sec}=

\mathrm{mph}

\newline

> Next Question

Understand conversion factors: Understand the conversion factors between feet per second and miles per hour. $\newline$ There are $5280$ feet in a mile and $3600$ seconds in an hour. To convert feet per second to miles per hour, we need to multiply by the number of feet in a mile and divide by the number of seconds in an hour.
Set up conversion: Set up the conversion from feet per second to miles per hour. To convert $61$ feet per second to miles per hour, we multiply by $5280$ (the number of feet in a mile) and then divide by $3600$ (the number of seconds in an hour).
Perform multiplication: Perform the multiplication. $61 \, \text{feet/second} \times 5280 \, \text{feet/mile} = 322080 \, \text{feet/mile}$
Perform division: Perform the division. $\frac{322080 \text{ feet/mile}}{3600 \text{ seconds/hour}} = 89.4666667 \text{ miles/hour}$
Round answer: Round the answer to a reasonable number of decimal places. $\newline$ Since speed is typically measured to the nearest whole number, we round $89.4666667$ to $89$ miles per hour.

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