Xiao Ming sat at the window of the train. The train drove from the south end of the bridge to the north end. Xiao Ming measured the elapsed time as 80 seconds. His father asked Xiao Ming how long the bridge was, so Xiao Ming immediately timed it from a certain telegraph pole beside the railway until It takes 25 seconds for the tenth electric pole. If the distance between every two electric poles on the roadside is 50 meters, Xiao Ming calculates the length of the bridge. How many meters is the bridge long?
小明坐在火车的窗口位置，火车从大桥的南端驶向北端，小明测得共用时80秒，爸爸问小明这座桥有多长，于是小明马上从铁路旁的某一根电线杆计时，直到第10根电线杆用时25秒，如果路旁每两根电线杆的距离为50米，小明算出了大桥的长度．大桥长多少米？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 / 25</gadget>
<output>9/25 = around 0.36</output>

<gadget id="calculator">50 * (9/25) * 80</gadget>
<output>1_440</output>

<result>1_440</result>