New Enroll in RBI Grade B New Batch - Starts on May 21

    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) × {2 × 26 + (24 – 1) × 12} = 12 × (52 + 276) = 3936 km Required average speed = 3936/24 = 164 km/h

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