A bridge is 2,500 meters long, and a train travels 980 meters per minute when passing the bridge. How long is this train?
一座大桥长2500米，一列火车通过大桥时每分钟行980米，从车头开上桥到车尾离开桥共需3分钟．这列火车长多少米？
<gadget id="calculator">3 * 980</gadget>
<output>2_940</output>

<gadget id="calculator">2_940 - 2_500</gadget>
<output>440</output>

<result>440</result>