On a map, the actual distance of 150 kilometers is represented by a 3 cm long line segment. On this map, the distance between A and B on the map is 12.5 cm. What is the actual distance between A and B in kilometers? ?
在一副地图上距离用3厘米长的线段表示150千米的实际距离，在这幅地图上量得甲、乙两地的图上距离为12.5厘米，甲乙两地的实际距离是多少千米？
<gadget id="calculator">150 * 100_000</gadget>
<output>15_000_000</output>

<gadget id="calculator">3 / 15_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">12.5 / (1/5_000_000) / 100_000</gadget>
<output>625</output>

<result>625</result>