Mingming's family took the train from Qingdao to Beijing, departing from Qingdao at 14:30, and arriving at Beijing Station at 19:30. It is known that the distance from Qingdao to Beijing is 860 kilometers. How many kilometers per hour does the train travel on average?
明明一家坐火车从青岛到北京，14：30从青岛出发，19：30到达北京车站．已知青岛到北京的路程有860千米．这列火车平均每小时行多少千米？
<gadget id="calculator">860 / 5</gadget>
<output>172</output>

<result>172</result>