On a map with a scale of 1:60000, the distance between A and B is 40 cm. A car travels from city A to city B, and it takes 4 hours to get there. How many kilometers per hour does it travel on average?
在一幅比例尺是1：60000的地图上，量得甲乙两地的距离是40厘米．一辆汽车从甲城到乙城，要求4小时到达，平均每小时行多少千米？
<gadget id="calculator">1 / 60_000</gadget>
<output>1/60_000 = around 0.000017</output>

<gadget id="calculator">40 / (1/60_000) / 100_000 / 4</gadget>
<output>6</output>

<result>6</result>