rectangular basketball court is 100 meters long and 60 meters wide. How many meters does it take to run two laps around the playground?
一个长方形的篮球场，长是100米，宽是60米．围着这个操场跑两圈，要跑多少米？
<gadget id="calculator">100 + 60</gadget>
<output>160</output>

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

<result>640</result>