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

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?

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