bus has 13 stops from the start point to the end point, and the distance between every two stops is 2 kilometers. How many kilometers is the total length of this section of the road?
一辆公共汽车从起点到终点共有13个站点，每两个站点相距2千米，则这段路全程长多少千米？
<gadget id="calculator">13 - 1</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>