The school playground is 100 meters long and 40 meters wide. Xiao Ming ran 3 laps along the side of the playground. How many meters did he run in total?
学校操场长100米，宽40米，小明沿着操场边跑3圈，他一共跑了多少米？
<gadget id="calculator">100 + 40</gadget>
<output>140</output>

<gadget id="calculator">140 * 2 * 3</gadget>
<output>840</output>

<result>840</result>