A rectangular piece of land is 30 meters long and has an area of 360 square meters. What is the perimeter of this rectangular piece of land in meters?
一块长方形地长30米，面积是360平方米，这块长方形地的周长是多少米？
<gadget id="calculator">360 / 30</gadget>
<output>12</output>

<gadget id="calculator">30 + 12</gadget>
<output>42</output>

<gadget id="calculator">42 * 2</gadget>
<output>84</output>

<result>84</result>