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      Question

      Pranav went to the bank at the speed of 60 km/h while

      returning for his home he covered the half of the distance at the speed of 10 km/h, but suddenly he realised that he was getting late so he increased the speed and reached the home by covering rest half of the distance at the speed of 30 km/h. The average speed of the Pranav in the whole length of journey is?
      A 24 km/h Correct Answer Incorrect Answer
      B 14 km/h Correct Answer Incorrect Answer
      C 16 km/h Correct Answer Incorrect Answer
      D 10 km/h Correct Answer Incorrect Answer

      Solution

      ATQ, we can say that Let the distance be 60 km. Time taken by Pranav from home to bank = 60/60 = 1 hour Time taken by Pranav to cover half distance between bank and home = 30/30 = 1 hour Time taken by Pranav to cover half distance between bank and home = 30/10 = 3 hours ∴ Average Speed = (60 + 30 + 30) / (1 + 1 + 3) = 120/5 = 24 km/hr

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