Plant trees equidistantly on both sides of a 700-meter-long road, planting at both ends of the road, a total of 42 trees are planted. What is the distance in meters between two adjacent trees?
在一段长700米的路的两侧等距离种树，路两端都种，共种42棵．相邻两棵树之间的距离是多少米？
<gadget id="calculator">42 / 2</gadget>
<output>21</output>

<gadget id="calculator">21 - 1</gadget>
<output>20</output>

<gadget id="calculator">700 / 20</gadget>
<output>35</output>

<result>35</result>