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    Question

    Ravi planned to cover a distance of 150 km by train. But

    due to a technical issue, the speed of the train dropped by 25%, and he reached his destination 1.5 hours late. Find the original speed of the train.
    A 11.11 km/h Correct Answer Incorrect Answer
    B 33.33 km/h Correct Answer Incorrect Answer
    C 66.66 km/h Correct Answer Incorrect Answer
    D 13.13 km/h Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the original speed of the train = ‘y’ km/h

    Then, decreased speed of the train = 0.75 × y = ‘0.75y’ km/h

    According to the question,

    (150/0.75y) – (150/y) = 1.5

    Or, (600/3y) – (450/3y) = 1.5

    Or, (150/3y) = (50/y) = 1.5

    So, y = 50 ÷ 1.5 = 33.33 km/h

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