On a map with a scale of (1/2000000), 2 cm on the map represents the actual distance in kilometers.
在一幅比例尺为(1/2000000)的地图上，图上2厘米表示实际距离多少千米．
<gadget id="calculator">1 / 2_000_000</gadget>
<output>1/2_000_000 = around 0</output>

<gadget id="calculator">2 / (1/2_000_000) / 100_000</gadget>
<output>40</output>

<result>40</result>