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Q:

The speed of two trains are in the ratio of 3:4. They are going in opposite directions along parallel tracks. If each takes 3 seconds to cross a telegraph post, find the time taken by the trains to cross each other completely?

  • 1
    1 second
  • 2
    3 second
  • 3
    5 second
  • 4
    7 second
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Answer : 2. "3 second"

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