The length of the road from Wuhan to Changsha, Hunan is 280 kilometers, and it takes 4 hours for a bus to travel. What is the speed of the bus in kilometers per hour?
武汉到湖南长沙的公路长是280千米，客车要行4小时，客车的速度是多少千米/时
<gadget id="calculator">280 / 4</gadget>
<output>70</output>

<result>70</result>