A total of 162 trees are planted on both sides of a 2,400-meter-long avenue (trees are planted at both ends). What is the average distance between two adjacent trees along the avenue?
一条长2400米的大道两旁共植树162棵(两端都栽树)，大道一旁平均相邻两棵树之间的距离为多少米？
<gadget id="calculator">162 / 2</gadget>
<output>81</output>

<gadget id="calculator">81 - 1</gadget>
<output>80</output>

<gadget id="calculator">2_400 / 80</gadget>
<output>30</output>

<result>30</result>