The actual distance between cities A and B is 120 kilometers. On a map with a scale of 1:4,000,000, what is the distance on the map between these two cities?
甲、乙两城市间的实际距离是120千米，在比例尺1：4000000的地图上，这两个城市间的图上距离是多少？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

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

<result>3</result>