Alex Mahone was standing on a bridge and precisely 5m away from the center of the bridge. He saw a train coming from the end that was nearest to him. Seeing it, he ran towards the train and managed to jump off the track when the train was 2m away from the bridge. However, if he would have run in the opposite direction, the train would have hit him 2m before the end of the bridge.
If the speed of train is four times that of Alex Mahone, what is the length of the bridge in meters?