On one side of a section of the road, a telegraph pole is erected every 25 meters (both ends are erected), and a total of 30 poles are erected from the beginning to the end. How long is the road?
一段路的一侧每隔25米架一根电线杆(两端都架)，从头到尾共架了30根．这段路有多长？
<gadget id="calculator">30 - 1</gadget>
<output>29</output>

<gadget id="calculator">25 * 29</gadget>
<output>725</output>

<result>725</result>