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    Question

    A train moves at 90 km/h and needs to cover a journey in

    2 hours. It halts for 10 minutes at the midpoint. What speed must it take for the second half?
    A 108 km/h Correct Answer Incorrect Answer
    B 90 km/h Correct Answer Incorrect Answer
    C 110 km/h Correct Answer Incorrect Answer
    D 120 km/h Correct Answer Incorrect Answer

    Solution

    Total distance = 90 Ă— 2 = 180 km
    Half distance time = (90 Ă· 90) Ă— 60 = 60 minutes
    Time left = 120 – 60 – 10 = 50 minutes
    Required speed = (90 Ă· 50) Ă— 60 = 108 km/h

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