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      Question

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

      will take 60 minutes to reach his destination. But after completing half the journey, the man took a break of 10 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

      Solution

      Total distance to be covered = 40 Γ— (60/60) = 40 km Time taken to cover half the distance at original speed = {(40 Γ· 2) Γ· 40} Γ— 60 = 30 minutes Time remaining = 60 – 30 – 10 = 20 minutes Required speed = 20 Γ· 20 Γ— 60 = 60 km/h

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