On a map with a scale of 1:400,000, the distance between the two places is about 12 centimeters. What is the actual distance between the two places in kilometers?
在比例尺是1：400000的地图上，量得两地之间的距离约12厘米，两地之间的实际距离大约是多少千米．
<gadget id="calculator">1 / 400_000</gadget>
<output>1/400_000 = around 0.000002</output>

<gadget id="calculator">12 / (1/400_000) / 100_000</gadget>
<output>48</output>

<result>48</result>