Of the two wires, the first one is 48.3 meters long, which is 6.5 meters longer than the second one. After the first one is 9.4 meters long, how much less is it than the second one?
两根电线，第一根长48.3米，比第二根长6.5米，第一根用去9.4米后，比第二根少多少米？
<gadget id="calculator">48.3 - 6.5</gadget>
<output>41.8</output>

<gadget id="calculator">48.3 - 9.4</gadget>
<output>38.9</output>

<gadget id="calculator">41.8 - 38.9</gadget>
<output>2.9</output>

<result>2.9</result>