On a drawing with a scale of 1:4000, a playground is 3 cm long and 2 cm wide. What is the actual area of the playground in hectares?
在比例尺是1：4000的图纸上，量得一个操场长3厘米，宽2厘米，这个操场的实际面积是多少公顷．
<gadget id="calculator">1 / 4_000</gadget>
<output>1/4_000 = around 0.00025</output>

<gadget id="calculator">3 / (1/4_000) / 100</gadget>
<output>120</output>

<gadget id="calculator">2 / (1/4_000) / 100 / 10_000</gadget>
<output>1/125 = around 0.008</output>

<gadget id="calculator">120 * (1/125)</gadget>
<output>24/25 = around 0.96</output>

<result>24/25 = around 0.96</result>