The rectangular playground is 55 meters long and 35 meters wide. Xiaohua ran 3 laps along the side of the playground, how many meters did he run?
长方形操场，长55米，宽35米．小华沿操场的边跑3圈，跑了多少米？
<gadget id="calculator">55 + 35</gadget>
<output>90</output>

<gadget id="calculator">90 * 2 * 3</gadget>
<output>540</output>

<result>540</result>