Plant saplings on one side of the road. First plant one tree at one end of the road, and then plant one tree every 5 meters. From the beginning to the end, a total of 10 trees are planted. How many meters is this road?
在路的一侧栽树苗，先在路的一端栽一棵，以后每隔5米栽一棵，从起点到终点一共栽了10棵，这条道路有多少米．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

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

<result>45</result>