It takes 36 seconds for a train to pass through a tunnel at a speed of 45 meters per second. The train is 530 meters long. How long is the tunnel?
一列火车以每秒45米的速度通过一个隧道用了36秒，这列火车长530米，这个隧道长多少米？
<gadget id="calculator">36 * 45</gadget>
<output>1_620</output>

<gadget id="calculator">1_620 - 530</gadget>
<output>1_090</output>

<result>1_090</result>