On a map with a scale of 1:100000, the distance between A and B on the map is 5 cm. What is the actual distance in kilometers between A and B?
在一幅比例尺是1：100000的地图上，量得A、B两地的图上距离是5厘米，A、B两地的实际距离是多少千米．
<gadget id="calculator">5 / 100_000</gadget>
<output>1/20_000 = around 0.00005</output>

<gadget id="calculator">100_000 * (1/20_000)</gadget>
<output>5</output>

<result>5</result>