The scale of the line segment on the map is 1:3000000, if the actual distance is 450 kilometers, how many centimeters should be drawn on the map.
地图上的线段比例尺是1：3000000，如果实际距离是450千米，那么在图上要画多少厘米．
<gadget id="calculator">1 / 3_000_000</gadget>
<output>1/3_000_000 = around 0</output>

<gadget id="calculator">450 * 100_000 * (1/3_000_000)</gadget>
<output>15</output>

<result>15</result>