There are 108 trees on each side of a road (one tree at each end of the road), and the distance between every two adjacent trees is 15 meters. Do you know how long this road is?
一段马路上每一边都有108棵树(马路的两端各有一棵树)，每相邻两棵树之间的距离都是15米，你知道这段马路有多长吗？
<gadget id="calculator">108 - 1</gadget>
<output>107</output>

<gadget id="calculator">107 * 15</gadget>
<output>1_605</output>

<result>1_605</result>