rectangular playground is 250 meters long and 400 meters wide. How many hectares does this playground occupy?
一块长方形操场，长250米，宽400米，这个操场占地多少公顷．
<gadget id="calculator">250 * 400</gadget>
<output>100_000</output>

<gadget id="calculator">100_000 / 10_000</gadget>
<output>10</output>

<result>10</result>