On a map with a scale of 1:500000, the measured distance between A and B is 12cm. What is the actual distance between A and B in km?
在比例尺是1：500000的地图上，量得甲、乙两地之间的距离是12cm，甲、乙两地间的实际距离是多少km．
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">12 / (1/500_000) / 100_000</gadget>
<output>60</output>

<result>60</result>