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    Question

    The area of a square field is 1250 sq m. How long in seconds will a lady take to cross the field diagonally at the rate of 5 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 = 1250 where D is diagonal, So D 2 = 5000 So D = 50m So time taken by a lady to cover diagonal = Distance/speed = 50m/5kmph = 50m/{5×(5/18 m/s)} = 36 sec

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