A 180-meter-long train passes through a tunnel. According to the monitoring records, it takes 43 seconds for the train to enter the tunnel and leave the tunnel completely. The time for the whole train to be completely inside the tunnel is 23 seconds. Question: How long is the tunnel?
一列180米长的火车途经一隧道，看监控记录知火车从进入隧道到完全离开隧道用时43秒，整列火车完全在隧道内的时间为23秒，问：隧道有多长？
<gadget id="calculator">43 - 23</gadget>
<output>20</output>

<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">180 * (1/10)</gadget>
<output>18</output>

<gadget id="calculator">18 * 43</gadget>
<output>774</output>

<gadget id="calculator">774 - 180</gadget>
<output>594</output>

<result>594</result>