Of the two wires, the first one is 57.4 meters long, which is 5.5 meters longer than the second one. After the first one is 10.9 meters long, how much less is it than the second one?
两根电线，第一根长57.4米，比第二根长5.5米，第一根用去10.9米后，比第二根少多少米？
<gadget id="calculator">57.4 - 5.5</gadget>
<output>51.9</output>

<gadget id="calculator">57.4 - 10.9</gadget>
<output>46.5</output>

<gadget id="calculator">51.9 - 46.5</gadget>
<output>5.4</output>

<result>5.4</result>