The school's rectangular playground is 120 meters long and 40 meters wide. How many meters is it to run two laps along the edge of the playground?
学校长方形的操场长120米，宽40米，沿操场边沿跑两圈是多少米．
<gadget id="calculator">120 + 40</gadget>
<output>160</output>

<gadget id="calculator">160 * 2 * 2</gadget>
<output>640</output>

<result>640</result>