John travels 150 miles in 2 hours.  The speed limit is 60 mph.  How many mph above the speed limit was he driving?
He was driving 150/2=
<gadget id="calculator">150/2</gadget>
<output>75</output>
75 mph.
So he was 75-60=
<gadget id="calculator">75-60</gadget>
<output>15</output>
15 mph above the speed limit.

<result>15</result>