A train travels 640 kilometers from 8:00 am to 4:00 pm, how many kilometers per hour on average?
一列火车从上午8时到下午4时共行驶640千米，平均每小时行驶多少千米？
<gadget id="calculator">640 / 8</gadget>
<output>80</output>

<result>80</result>