The distance between A and B is 20km, how many centimeters should be drawn on a map with a scale of 1:1,000,000.
A、B两地的距离是20km，在比例尺是1：1000000的地图上，应画多少cm．
<gadget id="calculator">1 / 1_000_000</gadget>
<output>1/1_000_000 = around 0.000001</output>

<gadget id="calculator">20 * 100_000 * (1/1_000_000)</gadget>
<output>2</output>

<result>2</result>