On a map with a scale of 1:5000000, if the distance between A and B is 8cm, what is the actual distance between A and B in km?
在比例尺1：5000000的地图上，如果量得甲、乙两地距离是8cm，那么甲、乙两地实际距离是多少km．
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">8 / (1/5_000_000) / 100_000</gadget>
<output>400</output>

<result>400</result>