A road is 1560m long, with one lamppost at each end (one side), and 38 lampposts in the middle. The distance between every two lampposts is the same, so what is the distance between them?
一条马路长1560m，两头(单侧)各有灯柱1根，中间共有灯柱38根．每两个灯柱间的距离一样，那么它们之间的间距是多少？
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">38 + 1</gadget>
<output>39</output>

<gadget id="calculator">1_560 / 39</gadget>
<output>40</output>

<result>40</result>