On a map with a scale of 1:2000000, the distance from Qionghai to Haikou is 4.1 cm. What is the actual distance from Qionghai to Haikou in kilometers?
在一幅比例尺为1：2000000的地图上量得琼到海口的距离是4.1厘米，琼海到海口的实际距离是多少千米．
<gadget id="calculator">1 / 2_000_000</gadget>
<output>1/2_000_000 = around 0</output>

<gadget id="calculator">4.1 / (1/2_000_000) / 100_000</gadget>
<output>82</output>

<result>82</result>