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    Question

    A man first travels 160 km at 24 km/hr and next 160 km

    at 40 km/hr. The average speed for the first 320 km of his travelling is:
    A 28 km/hr Correct Answer Incorrect Answer
    B 30 km/hr Correct Answer Incorrect Answer
    C 42 km/hr Correct Answer Incorrect Answer
    D 35 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Total time taken = [(160/24) + (160/40)] hrs = 32/3 hrs Average speed = 320 x (3/32) km/hr = 30 km/hr

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