The scale of a map is 1:500000. The distance between cities A and B on this map is 3.6 cm. What is the actual distance in kilometers between them?
一幅地图的比例尺是1：500000．这幅地图上甲、乙两城市相距3.6厘米，它们之间的实际距离是多少千米．
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">3.6 / (1/500_000) / 100_000</gadget>
<output>18</output>

<result>18</result>