The distance between A and B is 280 kilometers. A car departs from A at 10 am and arrives at B at 3 pm. How many kilometers per hour does the car travel on average?
甲、乙两地相距280千米，一辆汽车上午10点从甲地出发，下午3点到达乙地，这辆汽车平均每小时行多少千米？
<gadget id="calculator">280 / 5</gadget>
<output>56</output>

<result>56</result>