A rectangular playground is 100 meters long and 40 meters wide. If you run 5 laps around the playground, how many meters will you run?
一个长方形操场，长是100米，宽40米，围着这个操场跑5圈，要跑多少米？
<gadget id="calculator">100 + 40</gadget>
<output>140</output>

<gadget id="calculator">140 * 2 * 5</gadget>
<output>1_400</output>

<result>1_400</result>