Trees are planted on one side of a road, and both ends are loaded. The distance between every two adjacent trees is 6 meters. A total of 121 trees are planted. How long is this road in meters? (When planting trees on a line that is not connected at the beginning and end, including both ends, the number of segments = the number of trees - 1)
在一条马路的一侧栽树，两端都载，每相邻两棵树的间距都是6米，共栽树121棵，这条马路长多少米？(在首尾不相接的线路上栽树时，包括两端，段数=棵数-1)
<gadget id="calculator">121 - 1</gadget>
<output>120</output>

<gadget id="calculator">120 * 6</gadget>
<output>720</output>

<result>720</result>