In order to improve the environment of a residential area, it is necessary to plant trees equidistantly on both sides of the road connecting the front and rear buildings. The distance between two adjacent trees is 3 meters, and a total of 32 trees are planted, how long is the road?
为了改善某居民小区的环境，需要在连接前后两栋楼间的道路两旁等距离地栽树．相邻两棵树之间的距离是3米，一共栽了32棵树，则这条道路有多长？
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>