Question
A train moving at 90 km/h crosses a pole in 12 seconds.
How much time will it take to cross another train, twice as long, coming from the opposite direction at the same speed?Solution
Speed of Train A = 90 × 5/18 = 25 m/s
Length of Train A = 25 × 12 = 300 m
Length of Train B = 2 × 300 = 600 m
Speed of Train B = 90 × 5/18 = 25 m/s
Total length = 300 + 600 = 900 m
Relative speed = 25 + 25 = 50 m/s
Time = 900 / 50 = 18 seconds
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