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Q: A 400-metre-long train is running at the speed of 60 km/hour. A man is running in the opposite direction of train at the speed of 12 km/hour. In how much time the train will cross this man?

  • 1
    50 second
  • 2
    30 second
  • 3
    20 second
  • 4
    40 second
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Answer : 3. "20 second"

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