On a map with a scale of 1:500000, the distance between A and B is 10cm. What is the actual distance between A and B in km?
在比例尺1：500000的地图上，量得甲、乙两地之间距离是10cm，甲、乙两地的实际距离是多少km．
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">10 / (1/500_000) / 100_000</gadget>
<output>50</output>

<result>50</result>