The ratio of length to width of a rectangular playground is 3:1. Use a scale of 1:1000 to draw the playground plan on the paper, and measure the perimeter of the rectangle on the plan to be 64 cm. What is the actual length of the playground in meters?
一个长方形操场的长和宽的比是3：1．用1：1000的比例尺将操场平面图画在图纸上，量得平面图上的长方形周长是64厘米．操场的实际长度是多少米．
<gadget id="calculator">64 / 2</gadget>
<output>32</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 1_000</gadget>
<output>1/1_000 = around 0.001</output>

<gadget id="calculator">(3/4) / (1/1_000) / 100</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">32 * (15/2)</gadget>
<output>240</output>

<result>240</result>