If the length of a rectangular piece of land is increased by 40 meters and the width remains the same, the area is increased by 1 hectare; if the width is increased by 25 meters, the length remains the same and the area is also increased by 1 hectare. What is the area of the original rectangle?
将一块长方形地的长增加40米，宽不变，面积增加1公顷，将宽增加25米，长不变，面积也增加1公顷．原来这块长方形地的面积是多少公顷？
<gadget id="calculator">1 * 10_000</gadget>
<output>10_000</output>

<gadget id="calculator">10_000 / 40</gadget>
<output>250</output>

<gadget id="calculator">10_000 / 25 / 10_000</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">250 * (1/25)</gadget>
<output>10</output>

<result>10</result>