The distance between the two places is measured as 2.5cm on a map with a scale of 1:5000000. What is the actual distance in km between the two places?
在一幅比例尺为1：5000000地图上量得两地间距离为2.5cm，两地间的实际距离是多少km．
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">2.5 / (1/5_000_000) / 100_000</gadget>
<output>125</output>

<result>125</result>