The school playground is a rectangle with a length of 60 meters and a width of 40 meters. The physical education class runs 2 laps around the playground. How many meters does it take?
学校操场是一个长方形，长是60米，宽是40米，体育课围着这个操场跑2圈，要跑多少米？
<gadget id="calculator">60 + 40</gadget>
<output>100</output>

<gadget id="calculator">100 * 2 * 2</gadget>
<output>400</output>

<result>400</result>