A car traveled 360 miles in 4 hours and 30 minutes. What was its speed in miles per hour?
There are 60 minutes in one hour, so the car traveled 360 miles in 4 hours + 30 minutes/60 minutes/hour = 4.5 hours.
In one hour, the car travels 360 miles / 4.5 hours = 
<gadget id="calculator">360/4.5</gadget>
<output>80</output>
80 miles/hour.

<result>80</result>