bridge is 2,500 meters long, and a train travels 960 meters per minute when passing the bridge. It takes 3 minutes from the front of the train on the bridge to the time 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960米，从火车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 * 960</gadget>
<output>2_880</output>

<gadget id="calculator">2_880 - 2_500</gadget>
<output>380</output>

<result>380</result>