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      Question

      A man is travelling at a speed of 40 km/h such that he will

      take 90 minutes to reach his destination. But after completing half the journey, the man took a break of 15 minutes and then continued his journey. Find the speed at which the man must cover rest of the journey to reach his destination in original time.
      A 50 km/h Correct Answer Incorrect Answer
      B 72 km/h Correct Answer Incorrect Answer
      C 60 km/h Correct Answer Incorrect Answer
      D 48 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Total distance to be covered = 40 Ă— (90/60) = 60 km
      Time taken to cover half the distance at original speed = {(60 Ă· 2) Ă· 40} Ă— 60 = 45 minutes
      Time remaining = 90 – 45 – 15 = 30 minutes
      Required speed = 30 Ă· 30 Ă— 60 = 60 km/h

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