On a map with a scale of 1:6000000, the distance between A and B is measured to be 3.5 cm. What is the actual distance between A and B in kilometers?
在一幅比例尺为1：6000000地图上，量得A地与B地的距离为3.5厘米，求A、B两地的实际距离是多少千米？
<gadget id="calculator">1 / 6_000_000</gadget>
<output>1/6_000_000 = around 0</output>

<gadget id="calculator">3.5 / (1/6_000_000) / 100_000</gadget>
<output>210</output>

<result>210</result>