New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    Arjun, cycling at a speed of 81 km/hr, can complete one

    round of a square field in 8 seconds. The radius of a circular field is 4 meters more than each side of the squared field. Calculate the area of the circular field.
    A 5546 m² Correct Answer Incorrect Answer
    B 5452 m² Correct Answer Incorrect Answer
    C 6206 m² Correct Answer Incorrect Answer
    D 7546 m² Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    ATQ, Perimeter of the squared filed = {81 × (5/18)} × 8 = 180 metres Therefore each side of the squared field = 180/4 = 45 metres Radius of the circular field = 45 + 4 = 49 metres Therefore, area of the circular field = πr2 = (22/7) × 492 = 7546 m2 

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