If a site is measured on a map with a scale of 1:100,000 as a rectangle with a length of 5 cm and a width of 3 cm, what is the actual area of the site in hectares?
在比例尺是1：100000的地图上量得一场地是长是5厘米，宽是3厘米的长方形，那么该场地的实际面积是多少公顷．
<gadget id="calculator">1 / 100_000</gadget>
<output>1/100_000 = around 0.00001</output>

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

<gadget id="calculator">3 / (1/100_000) / 100 / 10_000</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">5_000 * (3/10)</gadget>
<output>1_500</output>

<result>1_500</result>