A bridge is 3,800 meters long. When a train passes the bridge at 800 meters per minute, it takes 5 minutes from the front of the train to the bridge to the rear of the train. How long is the train in meters?
一座大桥长3800米，一列火车通过大桥时每分钟800米，从车头上桥到车尾离桥共用5分钟，这列火车长多少米？
<gadget id="calculator">5 * 800</gadget>
<output>4_000</output>

<gadget id="calculator">4_000 - 3_800</gadget>
<output>200</output>

<result>200</result>