A tunnel is 2200 meters long. When a train passes through the tunnel, it travels 800 meters per minute. It takes 5 minutes from the front of the train entering the tunnel to the time the train leaves the tunnel. How long is the train in meters?
一个隧道长2200米，一列火车通过隧道时每分钟行驶800米，从车头开进隧道到车尾离开隧道共需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 - 2_200</gadget>
<output>1_800</output>

<result>1_800</result>