A car departs from Station A at 21:00 on the same day and arrives at Station B at 5:00 am the next day. It is known that stations A and B are 400 kilometers apart. Find the speed of this car.
一辆汽车当日21时从A站出发，于次日凌晨5时到达B站．已知A、B两站相距400千米．求这辆汽车的速度．
<gadget id="calculator">400 / 8</gadget>
<output>50</output>

<result>50</result>