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    Question

    Truck ‘P’ is 180 metres ahead of truck ‘Q’.

    Truck ‘P’ is moving at 18 m/s and truck ‘Q’ is moving at 72 km/h. How much time will truck ‘Q’ take to overtake truck ‘P’?
    A 65 secs Correct Answer Incorrect Answer
    B 42 secs Correct Answer Incorrect Answer
    C 90 secs Correct Answer Incorrect Answer
    D 50 secs Correct Answer Incorrect Answer

    Solution

    Speed of truck ‘Q’ = 72 ÷ 3.6 = 20 m/s
    So, relative speed of truck ‘Q’ with respect to truck ‘P’ = 20 – 18 = 2 m/s
    So, time taken by truck ‘Q’ to overtake truck ‘P’ = 180 ÷ 2 = 90 seconds

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