On a map of Shanghai urban area with a ratio of 1:20000, if the length of a certain section of Huaihai Road is 12cm, what is the actual length of this section of Huaihai Road?
在一张比例为1：20000的上海市区地图上，如果量出某段淮海路上的长度是12cm，那么这段淮海路的实际长度是多少．
<gadget id="calculator">1 / 20_000</gadget>
<output>1/20_000 = around 0.00005</output>

<gadget id="calculator">12 / (1/20_000) / 100</gadget>
<output>2_400</output>

<result>2_400</result>