Xiao Ming sits at the window of the train. The train runs from the south section of the bridge to the north. Xiao Ming measures that it takes 80 seconds. His father asks Xiao Ming how long the bridge is, So Xiao Ming immediately timed the time from a certain pole beside the railway, and it took 25 seconds to measure the 10th pole. It is known that the interval between two adjacent poles is 50 meters. Xiao Ming calculated the length of the bridge. Then how long is the bridge?

Xiao Ming sits at the window of the train. The train runs from the south section of the bridge to the north. Xiao Ming measures that it takes 80 seconds. His father asks Xiao Ming how long the bridge is, So Xiao Ming immediately timed the time from a certain pole beside the railway, and it took 25 seconds to measure the 10th pole. It is known that the interval between two adjacent poles is 50 meters. Xiao Ming calculated the length of the bridge. Then how long is the bridge?

To the tenth pole, there are nine sections with a total interval of 9 * 50 = 450 meters. It takes 25 seconds, 450 / 25 = 18 meters per second, and 80 * 18 = 1440 meters in 80 seconds

Xiao Ming sits at the window of the train. The train runs from the south end of the bridge to the north end. Xiao Ming measures the time of sharing 80 seconds,
Dad asked Xiao Ming how long the bridge was, so Xiao Ming immediately timed it from a certain pole beside the railway. It took 25 seconds to reach the 10th pole. If the distance between each two poles on the road was 50 meters, what was the length of the bridge

To the 10th pole, the distance that the train really passes is the interval of nine poles, because it took 25 seconds for Xiaoming to record the time from one pole, not counting the length (10-1) x 50 = 450 meters, and the train speed is 450 / 25=
It took 80 seconds for 18 m / s to cross the bridge. The length of the bridge is 18 x 80 = 1440 M

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