It takes 65 seconds for a train to cross the 990 meter bridge, and it takes 10 seconds for the train to pass by a wire at the same speed

Let the train be x meters in length and V meters per second in speed
x+990=65v
x=10v
The solution is x = 180 meters, v = 18 meters per second
The train is 180 meters and the speed is 18 meters per second

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