The school playground is a rectangle with a length of 80 meters and a width of 40 meters. What is the perimeter of the school playground in meters?
学校操场是一个长方形，长80米，宽40米，学校操场的周长是多少米？
<gadget id="calculator">80 + 40</gadget>
<output>120</output>

<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<result>240</result>