An airport is to build a new runway with a length of 2500 meters and a width of 80 meters. How many hectares?
一个飞机场新建一条跑道，长2500米，宽80米．占地多少公顷？
<gadget id="calculator">2_500 * 80</gadget>
<output>200_000</output>

<gadget id="calculator">200_000 / 10_000</gadget>
<output>20</output>

<result>20</result>