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      Question

      A car running with a speed of 60 km/hr takes 16 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 66.7 km/h Correct Answer Incorrect Answer
      B 76.7 km/h Correct Answer Incorrect Answer
      C 86.7 km/h Correct Answer Incorrect Answer
      D 96.7 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Total distance covered by the car in 16 hours = 60 x 16 = 960 km Time taken by the car in the return journey = 0.80 x 16 = 12.8 hours Average speed = Total distance covered ÷ Total time taken Average speed of the car = (960 x 2) ÷ (16 + 12.8) ~ 66.7 km/h

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