Xiaolin ran from the first tree to the tenth tree, and the distance between every two trees was 5 meters. How many meters did he run in total?
小林从第1棵树跑到第10棵树，每两棵树相距5米．他一共跑了多少米？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<result>45</result>