Plant trees on both sides of a road, planting one tree every 3 meters, a total of 600 trees were planted. How many meters is this road in total?
在一段公路的两边栽树，每隔3米栽一棵，一共栽了600棵．这段公路一共长多少米？
<gadget id="calculator">600 / 2</gadget>
<output>300</output>

<gadget id="calculator">300 - 1</gadget>
<output>299</output>

<gadget id="calculator">299 * 3</gadget>
<output>897</output>

<result>897</result>