If a 2.5 km long airstrip is drawn on a drawing with a scale of 1:500, how long is the airstrip in centimeters?
一条2.5千米长的飞机跑道，如果把它画在比例尺是1：500的图纸上，这条飞机跑道长多少厘米．
<gadget id="calculator">1 / 500</gadget>
<output>1/500 = around 0.002</output>

<gadget id="calculator">2.5 * 100_000 * (1/500)</gadget>
<output>500</output>

<result>500</result>