The distance between A and B is 120 kilometers. On a map with a scale of 1:3000000, the distance between A and B is measured in centimeters.
甲乙两地相距120千米，在一幅比例尺是1：3000000的地图上量得甲、乙两地的距离是多少厘米．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">120 * 100_000 * (1/3_000_000)</gadget>
<output>4</output>

<result>4</result>