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    Question

    The area of a square field is 800 sq m. How long in seconds will a lady take to cross the field diagonally at the rate of 4.8 km/hr?

    A 36 sec Correct Answer Incorrect Answer
    B 30 sec Correct Answer Incorrect Answer
    C 96 sec Correct Answer Incorrect Answer
    D 60 sec Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Area of a square = 1/2 (D) 2 = 800 where D is diagonal, So D 2 = 1600 So D = 40m So time taken by a lady to cover diagonal = Distance/speed = 40m/5kmph = 40m/{4.8 × (5/18 m/s)} = 30 sec

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