On a map with a scale of 1:20000000, the measured distance between the two places is 24 cm. What is the actual distance in km between the two places?
在比例尺是1：20000000的地图上，量得两地距离是24厘米，这两地的实际距离是多少km．
<gadget id="calculator">1 / 20_000_000</gadget>
<output>1/20_000_000 = around 0</output>

<gadget id="calculator">24 / (1/20_000_000) / 100_000</gadget>
<output>4_800</output>

<result>4_800</result>