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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 16 hours. If his initial speed was 50 km/h, then what was his average speed in the whole journey?
    A 120 km/h Correct Answer Incorrect Answer
    B 130 km/h Correct Answer Incorrect Answer
    C 140 km/h Correct Answer Incorrect Answer
    D 110 km/h Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Total distance travelled by A = (16/2) × {2 × 50 + (16 – 1) × 12} = 12 × (100 + 180) = 2240 km Required average speed = 2240/16 = 140 km/h

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