bridge is 2,500 meters long, and a train travels 920 meters per minute when passing the bridge. It takes 3 minutes from the time the locomotive drives onto the bridge to when the train leaves the bridge. How long is the train body?
一座大桥长2500米，一列火车通过大桥时每分钟行920米，从火车头开上桥到车尾离开桥共需3分钟．这列火车车身长多少米？
<gadget id="calculator">3 * 920</gadget>
<output>2_760</output>

<gadget id="calculator">2_760 - 2_500</gadget>
<output>260</output>

<result>260</result>