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      Question

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

      his speed by 12 km/h after every hour. He reached his destination in 24 hours. If his initial speed was 26 km/h, then what was his average speed in the whole journey?
      A 124 km/h Correct Answer Incorrect Answer
      B 134 km/h Correct Answer Incorrect Answer
      C 164 km/h Correct Answer Incorrect Answer
      D 144 km/h Correct Answer Incorrect Answer

      Solution

      Total distance travelled by A = (24/2) ├Ч {2 ├Ч 26 + (24 тАУ 1) ├Ч 12} = 12 ├Ч (52 + 276) = 3936 km Required average speed = 3936/24 = 164 km/h

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