2 trains running parallel to each other in opposite direction cross each other i

Loading

Practice Problems on Trains – 2 trains running parallel to each other in opposite direction cross each other in 20 seconds. A boy running on the platform with speed 10 m/s sees the trains and recorded that speed of train moving in his direction is 35 m/s and the train running opposite to him has a speed of 45 m/s. Also length of the train running in direction of boy is 200m. What is the length of the other train?

A cow was standing on a bridge, 5m away from middle of the bridge. A train was

Loading

Practice Problems on Trains – A cow was standing on a bridge, 5m away from middle of the bridge. A train was coming towards the bridge from the end nearest to the cow. seeing this the cow ran towards the train and managed to escape when the train was 2m away from the bridge. if it had run in the opposite direction (i.e away from the train ) it would have been hit by the train 2m before the end of the bridge , what is the length of the bridge in meters assuming speed of train is 4 times that of the cow?