A tree was planted every 5 meters on both sides of the path between two residential buildings, and a total of 42 trees were planted. How many meters is the distance between the two floors?
在两栋居民楼之间的小路两旁每隔5米栽一棵树，共栽42棵．两楼之间相距多少米？
<gadget id="calculator">42 / 2</gadget>
<output>21</output>

<gadget id="calculator">21 + 1</gadget>
<output>22</output>

<gadget id="calculator">22 * 5</gadget>
<output>110</output>

<result>110</result>