Tim is stuck in traffic for twice as long as he was driving.  He drove 5 hours.  How long was the trip?
He was stuck in traffic for 5*2=
<gadget id="calculator">5*2</gadget>
<output>10</output>
10 hours.
So his trip took 10+5=
<gadget id="calculator">10+5</gadget>
<output>15</output>
15 hours.

<result>15</result>