A train is 180 meters long and travels 20 meters per second. How long does it take for the train to pass through a 320-meter-long bridge?
一列火车长180米，每秒行20米，这列火车通过320米长的大桥，需要多少时间？
<gadget id="calculator">180 + 320</gadget>
<output>500</output>

<gadget id="calculator">500 / 20</gadget>
<output>25</output>

<result>25</result>