Question
Two trains are travelling in the same direction on
parallel tracks. Train A is travelling at 30 km/h and Train B is travelling at 60 km/h. If Train A is 400 m long and it takes Train B two minutes to pass Train A, what is the length of Train B?Solution
Speed of train A = 30 km/h Speed of train B = 60 km/h Length of train A = 400 m Time = 2 minutes = 120 seconds Relative Speed: relative Speed = VB - VA = 60-30=30 km/h  = 8.33 m/s Distance = 8.33 m/s × 120 s = 999.6 m Length of train B = 999.6 m -400 m =599.6 m =600m Apprpox
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