The train passed a bridge. Xiao Ming sat by the window and measured it from his seat. It took 80 seconds. His father asked Xiao Ming how long the bridge was. It takes 25 seconds to share the poles. If the distance between every two telephone poles next to the railway is 50 meters, please help Xiao Ming calculate how long the bridge is.
火车通过一座桥，小明坐在车窗边，从他的位子测得共用80秒，爸爸问小明这座桥有多长，小明马上从铁路旁的某根电线杆开始计时，到第十根电线杆共用时25秒，如果铁路旁每两根电线杆的间隔为50米，请你帮小明算算这座桥究竟有多长．
<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>