Draw a map, the scale is 1:2000000, the actual distance is 300 kilometers, how many centimeters should be drawn on the map.
画一张地图，比例尺是1：2000000，实际距离是300千米，地图上应画多少厘米．
<gadget id="calculator">1 / 2_000_000</gadget>
<output>1/2_000_000 = around 0</output>

<gadget id="calculator">300 * 100_000 * (1/2_000_000)</gadget>
<output>15</output>

<result>15</result>