A car has traveled a total of 280 kilometers from 9 am to 4 pm, how many kilometers per hour on average?
一辆汽车从上午9时到下午4时，共行驶了280千米，平均每小时行驶多少千米？
<gadget id="calculator">16 - 9</gadget>
<output>7</output>

<gadget id="calculator">280 / 7</gadget>
<output>40</output>

<result>40</result>