There is a sidewalk with a width of 4 meters, covering an area of 480 square meters. For convenience, the width of the road should be increased to 12 meters, and the length remains the same. What is the area of the sidewalk after widening?
有一条宽4米的人行道，占地面积480平方米，为了方便，道路的宽度要增加到12米，长不变，扩宽后这条人行道的面积是多少？
<gadget id="calculator">480 / 4</gadget>
<output>120</output>

<gadget id="calculator">120 * 12</gadget>
<output>1_440</output>

<result>1_440</result>