A row of telephone poles, the original distance between each two is 30 meters, now changed to 40 meters. If a utility pole at the starting point does not move, at least how far away is there a utility pole that does not need to move?
一排电线杆，原来每两根之间的距离是30米，现在改为40米．如果起点一根电线杆不移动，至少再隔多远有一根电线杆不需要移动？
<gadget id="calculator">2 * 2 * 2 * 3 * 5</gadget>
<output>120</output>

<result>120</result>