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Train A crosses a stationary train B of equal length in 40 seconds, a bridge of length 1320 meters in 1 minute 40 seconds, travelling at the same speed. Find the length of train A.
  • a)
    440 m
  • b)
    330 m
  • c)
    495 m
  • d)
    Cannot be determined
  • e)
    None of these
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Train A crosses a stationary train B of equal length in 40 seconds, a...
Let the lengths of train A and train B be 's' meters.
Given that
To travel '2s' meters the train took 40 seconds.
Speed of the train = s/20 m/s.
To travel s + 1320 meters, it took 100 seconds.
Therefore s +1320 = 100 x s/20
Therefore 4s = 1320
Therefore s = 330 meters.
Hence the correct option is (2).
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