A newly built expressway is 200 meters long and 40 meters wide. How many square kilometers does this expressway cover?
一条新建的高速公路，长200米，宽40米．这条高速公路占地多少平方千米？
<gadget id="calculator">40 / 1_000_000</gadget>
<output>1/25_000 = around 0.00004</output>

<gadget id="calculator">200 * (1/25_000)</gadget>
<output>1/125 = around 0.008</output>

<result>1/125 = around 0.008</result>