Question
Train A, when travelling at a speed of 108 km/h, crosses
a pole in 6 seconds. Find the time taken by Train A to cross another Train B of length 50% more than Train A, coming from the opposite direction at 72 km/h.Solution
Speed of Train A = 108 × 5/18 = 30 m/s
Length of Train A = 30 × 6 = 180 m
Length of Train B = 1.5 × 180 = 270 m
Speed of Train B = 72 × 5/18 = 20 m/s
Total distance = 180 + 270 = 450 m
Relative speed = 30 + 20 = 50 m/s
Time = 450 / 50 = 9 seconds
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