On a map with a scale of 1:500,000, the distance between the two cities is 16 cm. What is the actual distance in kilometers between the two cities?
在比例尺是1：500000的地图上量得两地之间的距离是16厘米，那么这两个城市间的实际距离是多少千米．
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">16 / (1/500_000) / 100_000</gadget>
<output>80</output>

<result>80</result>