Question

A car is driving at a speed of 60 mi/h. What is the speed of the car in feet per minute?

Answer 1

We need to use conversion factors in this problem. These are the ones you need:
\[\frac{5280 feet}{1 mile}\]
\[\frac{1 hour}{60 minutes}\]

Answer 2

There are 5280 feet in a mile and there are 60 minutes in an hour.
We want the units to cancel out so we will be left with feet/min.

Answer 3

\[\large \frac{60 \text{Miles}}{1\text{Hour}} \times \frac{1 \text{Hour}}{60 \text{Minutes}} \times \frac{5280 \text{Feet}}{1 \text{Mile}}\]

So all that equals

\[\large \frac{1 \text{Mile}}{1 \text{Minute}} \times \frac{5280 \text{Feet}}{1\text{Mile}}\]
And then we get down to

\[\large \frac{5280 \text{Feet}}{\text{Minute}}\]