A map with a scale of 1:5,000,000. The distance between cities A and B on the map is 12cm. What is the actual distance in km?
一幅地图，比例尺是1：5000000，测出A、B两城市的图上距离是12cm，实际的距离是多少km．
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">12 / (1/5_000_000) / 100_000</gadget>
<output>600</output>

<result>600</result>