Apple can run at a rate of 3 miles per hour. Mac can run at a rate of 4 miles per hour. In minutes, how much faster will Mac run a 24 mile race?
First find how fast each runs. Apple = 24 miles / 3 miles per hour = 
<gadget id="calculator">24/3</gadget>
<output>8</output>
8 hours.
Mac = 24 miles / 4 miles per hour = 
<gadget id="calculator">24/4</gadget>
<output>6</output>
6 hours.
Mac runs 8 hours - 6 hours = 
<gadget id="calculator">8-6</gadget>
<output>2</output>
2 hours faster.
1 hour = 60 minutes, so, Mac runs faster by 2 hours * 60 minutes = 
<gadget id="calculator">2*60</gadget>
<output>120</output>
120 minutes.

<result>120</result>