When the train passes a bridge, Xiao Ming sits by the window. It takes 80 seconds to measure from his seat. His father asks Xiao Ming how long the bridge is. Xiao Ming starts to count the time from a certain pole beside the railway, and it takes 25 seconds for the tenth pole. If the distance between each two poles beside the railway is 50 meters, please help Xiao Ming calculate how long the bridge is
50 × (10-1) △ 25 × 80, = 450 × 25 × 80, = 1440 (m); answer: the length of the bridge is 1440 M
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- 1. Xiao Yun sits at the window of the train. The train runs from the south end of the bridge to the north end. Xiao Yun measures that the time of sharing is 80 seconds. His mother asks Xiao Yun how long the bridge is, so ↓ Then above: Xiaoyun immediately clocks from a certain pole beside the railway, and it takes 25 seconds to reach the 10th pole. If the distance between each two poles is 50 meters, Xiaoyun can calculate the length of the bridge. Then, how long is the bridge?
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