A highway is 15 kilometers long, how long should it be drawn on a traffic map with a scale of 1:500000.
一段高速公路长15千米，它在一张比例尺是1：500000的交通线路图上应画多少长．
<gadget id="calculator">1 / 500_000</gadget>
<output>1/500_000 = around 0.000002</output>

<gadget id="calculator">15 * 100_000 * (1/500_000)</gadget>
<output>3</output>

<result>3</result>