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Q:

A passenger train leaves Calcutta at 4 PM and travels at the rate of 30 kilometres an hour. The mail train leaves Calcutta at 9 PM and travels, on a parallel line of rails, at the rate of 45 km an hour, when will the second train overtake the first?

  • 1
    10 hrs after the first train start
  • 2
    12 hrs after the second train starts
  • 3
    10 hrs after the second train starts
  • 4
    12 hrs after the first train starts
  • 5
    None of these
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Answer : 3. "10 hrs after the second train starts"

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