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      Question

      A was travelling from point X to point Y. He increased

      his speed by 20 km/h after every hour. He reached his destination in 14 hours. If his initial speed was 60 km/h, then what was his average speed in the whole journey?
      A 100 km/h Correct Answer Incorrect Answer
      B 140 km/h Correct Answer Incorrect Answer
      C 190 km/h Correct Answer Incorrect Answer
      D 150 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Total distance travelled by A = (14/2) × {2 × 60 + (14 – 1) × 20} = 10 × (120 + 260) = 2660 km Required average speed = 2660/14 = 190 km/h

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