When Xiaomi was waiting for his friend at the train station, a train passed by it. It took 5 seconds. Now he knows that the speed of this train is 360 km/h. Ask: How long is this train?
小米在火车台站上等朋友时，有列火车从它旁边经过，用了5秒，现在知道这火车的速度为360千米/小时，问：这列火车长为多少？
<gadget id="calculator">5 * 100</gadget>
<output>500</output>

<result>500</result>