On a map with a scale of 1:3000000, how many cm is the distance of 60km.
在比例尺是1：3000000的地图上，60km的路程只有多少cm．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">60 * 100_000 * (1/3_000_000)</gadget>
<output>2</output>

<result>2</result>