The total length of the railway between A and B is 320 kilometers. The train departs at 6:30 and arrives at 10:30. How many kilometers does the train travel on average per hour?
甲、乙两地的铁路全长320千米，列车6：30出发，10：30到达，列车平均每小时行多少千米？
<gadget id="calculator">320 / 4</gadget>
<output>80</output>

<result>80</result>