On a drawing with a scale of 1:5000, a rectangular land is 10 cm long and 5 cm wide. What is the actual area of the land in hectares?
在比例尺是1：5000的图纸上，一长方形地长10厘米，宽5厘米，求这块地的实际面积是多少公顷？
<gadget id="calculator">1 / 5_000</gadget>
<output>1/5_000 = around 0.0002</output>

<gadget id="calculator">10 / (1/5_000) / 100</gadget>
<output>500</output>

<gadget id="calculator">5 / (1/5_000) / 100 / 10_000</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">500 * (1/40)</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>