On a map with a scale of (1/6000000), the distance between A and B is 20cm. What is the actual distance between A and B in km?
在比例尺是(1/6000000)的地图上，量得甲、乙两城的距离是20cm，甲乙两城的实际距离是多少km．
<gadget id="calculator">50_000 / 100_000</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 * (1/2)</gadget>
<output>10</output>

<result>10</result>