The scale of a map is 1:800000, and the distance between A and B is measured on a map as 2.5 cm, so how many kilometers is the actual distance between A and B?
一幅地图的比例尺是1：800000，在一幅地图上量得甲乙两地的距离是2.5厘米，，则甲乙两地的实际距离是多少千米？
<gadget id="calculator">1 / 800_000</gadget>
<output>1/800_000 = around 0.000001</output>

<gadget id="calculator">2.5 / (1/800_000) / 100_000</gadget>
<output>20</output>

<result>20</result>