On a map, the actual distance of 200 kilometers is represented by a line segment with a length of 4 cm. There is a 250-kilometer highway from city A to city B. How long is it in centimeters on this map?
在一幅地图上，用4厘米长的线段表示实际距离200千米，甲城到乙城有一条250千米的高速公路，它在这幅地图上长多少厘米？
<gadget id="calculator">200 * 100_000</gadget>
<output>20_000_000</output>

<gadget id="calculator">4 / 20_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">250 * 100_000 * (1/5_000_000)</gadget>
<output>5</output>

<result>5</result>