There is an airstrip with a length of 2.5 kilometers. On a drawing with a scale of 1:50000, how many centimeters should this airstrip be drawn?
有一条长2.5千米的飞机跑道，在比例尺是1：50000的图纸上，这条飞机跑道应画多少厘米．
<gadget id="calculator">1 / 50_000</gadget>
<output>1/50_000 = around 0.00002</output>

<gadget id="calculator">2.5 * 100_000 * (1/50_000)</gadget>
<output>5</output>

<result>5</result>