A rectangular playground is 65 meters long and 40 meters wide. Teacher Zhang walked 2 times along the side of the playground. How many meters did he walk in total?
一个长方形操场，长65米，宽40米，张老师沿操场的边走了2圈，一共走了多少米
<gadget id="calculator">65 + 40</gadget>
<output>105</output>

<gadget id="calculator">105 * 2 * 2</gadget>
<output>420</output>

<result>420</result>