A rope is 24.8 meters long. Xiaojun used 6.5 meters for the first time and 3.9 meters for the second time. How many meters is the rope shorter?
一根绳子长24.8米，小军第一次用去6.5米，第二次用去3.9米，这根绳子短了多少米？
<gadget id="calculator">6.5 + 3.9</gadget>
<output>10.4</output>

<result>10.4</result>