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    Question

    An Aeroplane flies along a Square field @ 50, 100, 200

    and 400 km/hours respectively. Then find the Average speed of the aeroplane during the whole journey?
    A 98.7Km/hr Correct Answer Incorrect Answer
    B 106.67Km/hr Correct Answer Incorrect Answer
    C 187.5Km/hr Correct Answer Incorrect Answer
    D 150 Km/hr Correct Answer Incorrect Answer
    E 200 Km/hr Correct Answer Incorrect Answer

    Solution

    Concept of Average Speed: LCM of 50, 100, 200 and 400 = 400 Now,Let side = LCM of 50, 100, 200 and 400 = 400 Now, Average Speed =total distance/ total time= (400 ×4)/(400/50+400/100+400/200+400/400) = (400 ×4)/15= 106.67 kmph

    Average Speed = (400 ×4)/(400/50+400/100+400/200+400/400) = (400 ×4)/15= 106.67 kmph

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