On a plan with a scale of 1:500, the length of a rectangular classroom is 3 cm and the width is 2 cm. Find the actual area of this classroom.
在一幅比例尺为1：500的平面图上量得一间长方形教室的长是3厘米，宽是2厘米．求这间教室的实际面积．
<gadget id="calculator">1 / 500</gadget>
<output>1/500 = around 0.002</output>

<gadget id="calculator">3 / (1/500) / 100</gadget>
<output>15</output>

<gadget id="calculator">2 / (1/500) / 100</gadget>
<output>10</output>

<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<result>150</result>