The distance between A and B is 400 kilometers. A car departs from A at 10:00 am and arrives at B at 3:00 pm. How many kilometers per hour does this car travel on average?
甲乙两地相距400千米，一辆汽车上午10：00从甲地出发，下午3：00到达乙地．这辆车平均每小时行多少千米？
<gadget id="calculator">400 / 5</gadget>
<output>80</output>

<result>80</result>