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    Question

    Car ‘P’ can cross a 600 metre long bridge in 20

    seconds. Car ‘P’ is 120 metres ahead of car ‘Q’ which is travelling in the same direction as that of car ‘P’ with a speed of 36 m/s. After how many seconds will car ‘Q’ meet car ‘P’?
    A 15 seconds Correct Answer Incorrect Answer
    B 18 seconds Correct Answer Incorrect Answer
    C 20 seconds Correct Answer Incorrect Answer
    D 24 seconds Correct Answer Incorrect Answer

    Solution

    Speed of car ‘P’ = 600 ÷ 20 = 30 m/s So, relative speed of car ‘Q’ with respect to car ‘P’ = 36 – 30 = 6 m/s Distance between the two cars = 120 metres So, time taken by car ‘Q’ to meet car ‘P’ = 120 ÷ 6 = 20 seconds

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