The railway from Changchun to Jilin is 90 kilometers long. If you draw it on a map with a scale of 1:200,000, how long should you draw the line?
长春到吉林的铁路长90千米，如果用1：200000的比例尺，画在一幅地图上，需要画多长的线段？
<gadget id="calculator">1 / 200_000</gadget>
<output>1/200_000 = around 0.000005</output>

<gadget id="calculator">90 * 100_000 * (1/200_000)</gadget>
<output>45</output>

<result>45</result>