On a map with a scale of (1/500000), 3 cm represents the actual distance in kilometers.
在一幅比例尺为(1/500000)的地图上，3厘米表示实际距离多少千米．
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">3 / (1/500_000) / 100_000</gadget>
<output>15</output>

<result>15</result>