Xiao Ming is running on a rectangular playground with a length of 120 meters and a width of 30 meters. How many meters is it to run two laps along the edge of the playground?
小明在一个长120米，宽30米长方形的操场上跑步，他沿操场边沿跑两圈是多少米．
<gadget id="calculator">120 + 30</gadget>
<output>150</output>

<gadget id="calculator">150 * 2 * 2</gadget>
<output>600</output>

<result>600</result>