The speed of the train A is 108 kmph and the length of the bridge is 6/7 of the length of the train and the time taken by the train A to cross the pole and bridge is 7 seconds and x seconds respectively.If the length of the train B is (45x). Then find the length of train B.
1
550 m
2
420 m
3
585 m
4
650 m
5
570 m