Three parallel tracks of 120 km are between X and Y . train A starts at 9 AM on the central track at 60 km/hr from X .train B starts at 10 AM at 60 km/hr from Y . train C starts at 11 AM at 90 km/hr from X .trains A and C are 100 m each and train B is 150 m long. What is the total time taken by train B fir crossing the other trains ?
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