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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 25 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 80 km/h Correct Answer Incorrect Answer
      B 60 km/h Correct Answer Incorrect Answer
      C 70 km/h Correct Answer Incorrect Answer
      D 90 km/h Correct Answer Incorrect Answer
      E 100 km/h Correct Answer Incorrect Answer

      Solution

      Total distance to be covered = 40 Γ— (90/60) = 60 km Time taken to cover half the distance at original speed = {(60 Γ· 2) Γ· 40} Γ— 60 = 45 minutes Time remaining = 90 – 45 – 25 = 20 minutes Required speed = 30 Γ· 20 Γ— 60 = 90 km/h

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