On a section of highway, set up a sign every 5 kilometers from the starting point to the ending point. There are 6 signs on this road. How many kilometers is the total length of this road?
在一段公路上，从起点到终点每隔5千米设一块指示牌．这段路上共有6块指示牌．这段路总长多少千米？
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>