On a map with a scale of 1:500,000, the measured distance between A and B is 8 cm. What is the actual distance in kilometers between A and B?
在一幅比例尺是1：500000的地图上，测得A、B两地的距离是8厘米，A、B两地之间的实际距离是多少千米？
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">8 / (1/500_000) / 100_000</gadget>
<output>40</output>

<result>40</result>