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      Question

      Average speed of β€˜A’ during a 30-hour journey is 34

      km/h. If he covered the first 180 km of his journey at a speed of 20 km/h, then find the speed at which β€˜A’ travelled during the remaining journey.
      A 40 km/h Correct Answer Incorrect Answer
      B 41 km/h Correct Answer Incorrect Answer
      C 50 km/h Correct Answer Incorrect Answer
      D 45 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Total distance covered by β€˜A’ = 30 Γ— 34 = 1020 km Time taken to cover 180 km = 180/20 = 9 hours Time taken to cover remaining distance = 30 – 9 = 21 hours So, required speed = {(1020 – 180)/21} = 40 km/h

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