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      Question

      Rahul takes 5 hours to drive from town 'P' to town 'Q' at a

      speed of 50 km/h. He then increases his speed by 20% and takes 3 hours to reach town 'R' from 'Q'. What is Rahul's average speed from town 'P' to 'R'?
      A 42.65 km/h Correct Answer Incorrect Answer
      B 35.55 km/h Correct Answer Incorrect Answer
      C 69.65 km/h Correct Answer Incorrect Answer
      D 53.75 km/h Correct Answer Incorrect Answer

      Solution

      ATQ,

      Distance between town 'P' and town 'Q' = 50 Ă— 5 = 250 km

      Distance between town 'Q' and town 'R' = 50 Ă— 1.2 Ă— 3 = 180 km

      Total distance travelled by Rahul = 250 + 180 = 430 km

      Total time taken by Rahul = 5 + 3 = 8 hours

      Average speed of Rahul = 430 / 8 = 53.75 km/h

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