On the design drawing with a scale of 1:5000, the length of a playground is 4cm and the width is 3cm. What is the actual area of the playground in m**2.
在比例尺1：5000的设计图上，一个操场的长4cm，宽3cm，这个操场的实际面积是多少m**2．
<gadget id="calculator">1 / 5_000</gadget>
<output>1/5_000 = around 0.0002</output>

<gadget id="calculator">4 / (1/5_000) / 100</gadget>
<output>200</output>

<gadget id="calculator">3 / (1/5_000) / 100</gadget>
<output>150</output>

<gadget id="calculator">200 * 150</gadget>
<output>30_000</output>

<result>30_000</result>