A road with a length of 4.2km, how many centimeters should be drawn on a map with a scale of 1:30000.
一条长4.2km的公路，在比例尺是1：30000的地图上应画多少cm．
<gadget id="calculator">1 / 30_000</gadget>
<output>1/30_000 = around 0.000033</output>

<gadget id="calculator">4.2 * 100_000 * (1/30_000)</gadget>
<output>14</output>

<result>14</result>