I run 12 miles in 90 minutes. What is my average speed in miles per hour?
First convert 90 minutes to hours: 90 minutes / 60 minutes/hours = 
<gadget id="calculator">90/60</gadget>
<output>3/2 = around 1.5</output>
1.5 hours.
In 1 hour, I run 12 miles / 1.5 hours = 
<gadget id="calculator">12/1.5</gadget>
<output>8</output>
8 miles/hour.

<result>8</result>