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    Question

    A truck moving at 30 km/h is overtaken by a train in 20

    seconds. If the train is travelling at twice the speed of the truck, calculate its length.
    A 130.5 m Correct Answer Incorrect Answer
    B 125.1 m Correct Answer Incorrect Answer
    C 170.9 m Correct Answer Incorrect Answer
    D 166.6 m Correct Answer Incorrect Answer

    Solution

    ATQ,

    Speed of the truck = 30 × (5/18) = 8.33 m/s

    So, speed of the train = 8.33 × 2 = 16.66 m/s

    Let the length of the train be 'x' metres

    ATQ:

    x / (16.66 - 8.33) = 20

    So, x = 166.6

    Length of the train ≈ 166.6 metres

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