The distance between the two places is 80 kilometers. How many centimeters should be drawn on a map with a scale of 1:400000?
两地相距80千米，画在比例尺是1：400000的地图上，应画多少厘米．
<gadget id="calculator">1 / 400_000</gadget>
<output>1/400_000 = around 0.000002</output>

<gadget id="calculator">80 * 100_000 * (1/400_000)</gadget>
<output>20</output>

<result>20</result>