On a map with a scale of 1:2,000,000, the distance between A and B is 10 centimeters. It takes 2.5 hours for a car to drive from A to B. How many kilometers does it travel on average per hour?
在比例尺是1：2000000的地图上，量得甲、乙两城之间的距离是10厘米，一辆汽车从甲城开到乙城用了2.5小时，平均每小时行驶多少千米、
<gadget id="calculator">1 / 2_000_000</gadget>
<output>1/2_000_000 = around 0</output>

<gadget id="calculator">10 / (1/2_000_000) / 100_000 / 2.5</gadget>
<output>80</output>

<result>80</result>