There is a street lamp every 40 meters on Ye Ting Road. A total of 120 street lamps will be installed on both sides of the road from beginning to end. How many meters is the total length of this section of Ye Ting Road?
叶挺路上每隔40米有一盏路灯，道路两侧从头至尾一共要安装120盏路灯，这段叶挺路全长多少米？
<gadget id="calculator">69 * 40</gadget>
<output>2_760</output>

<result>2_760</result>