The distance between two stations is 400 kilometers. A car travels from one station to another. It takes 6 hours to go there and 1 hour less to return. What is the speed of the car when it returns?
两个车站相距400千米，一辆汽车从一个车站驶向另一个车站，去时用了6小时，返回时少用了1小时，返回时的速度是多少？
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">400 / 5</gadget>
<output>80</output>

<result>80</result>