On a map with a scale of 1:6000000, the measured distance between A and B is 3.5cm. Find the real distance between A and B.
在一幅比例尺是1：6000000的地图，测得甲、乙两城间距离是3.5cm，求甲、乙两城间的实距．
<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>