How many centimeters do you need to draw a line segment on a map with a scale of (1/30000) to indicate that the distance between the two places is 4.5 kilometers.
在比例尺是(1/30000)的图上画表示两地距离为4.5千米的线段要画多少厘米．
<gadget id="calculator">1 / 30_000</gadget>
<output>1/30_000 = around 0.000033</output>

<gadget id="calculator">4.5 * 100_000 * (1/30_000)</gadget>
<output>15</output>

<result>15</result>