On a map with a scale of 1:2500000. If the distance between A and B is 4 cm, how many kilometers is the actual distance between these two places?
在一幅比例尺是1：2500000的地图上．量得甲地与乙地的距离是4厘米，这两地间的实际距离是多少千米？
<gadget id="calculator">1 / 2_500_000</gadget>
<output>1/2_500_000 = around 0</output>

<gadget id="calculator">4 / (1/2_500_000) / 100_000</gadget>
<output>100</output>

<result>100</result>