The total length from station 1 to station 2 is 3600 meters. Between station 1 and station 2, the distance between two adjacent electric poles is 120 meters. How many electric poles are needed in total?
从一站到2站全长3600米，在1站和2站之间按电线每相邻2根电杆的距离是120米问一共要多少根电杆？
<gadget id="calculator">3_600 / 120</gadget>
<output>30</output>

<gadget id="calculator">30 + 1</gadget>
<output>31</output>

<result>31</result>