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      Question

      A car running with a speed of 55 km/hr takes 12 hours to

      go from 'A' to 'B'. If on the way back from 'B' to 'A', the car takes 20% less time than it takes while going from 'A' to 'B', then find the approximate average speed of the car during the whole journey
      A 71.1 km/h Correct Answer Incorrect Answer
      B 41.1 km/h Correct Answer Incorrect Answer
      C 51.1 km/h Correct Answer Incorrect Answer
      D 61.1 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Total distance covered by the car in 12 hours = 55 x 12 = 660 km Time taken by the car in the return journey = 0.80 x 12 = 9.6 hours Average speed = Total distance covered ÷ Total time taken Average speed of the car = (660 x 2) ÷ (12 + 9.6) ~ 61.1 km/h

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