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    Question

    Aman takes 2 hours to bike from point 'M' to point 'N'

    at a speed of 25 km/h. He then increases his speed by 80% and takes 3 hours to reach point 'O' from 'N'. What is Aman's average speed from point 'M' to 'O'?
    A 27 km/h Correct Answer Incorrect Answer
    B 67 km/h Correct Answer Incorrect Answer
    C 37 km/h Correct Answer Incorrect Answer
    D 55 km/h Correct Answer Incorrect Answer

    Solution

    ATQ,

    Distance between point 'M' and point 'N' = 25 × 2 = 50 km

    Distance between point 'N' and point 'O' = 25 × 1.8 × 3 = 135 km

    Total distance travelled by Aman = 50 + 135 = 185 km

    Total time taken by Aman = 2 + 3 = 5 hours

    Average speed of Aman = 185 / 5 = 37 km/h

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