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    How many seconds will a boy take to run one complete round around a square field of side 42 metres, if he runs at a speed of 12 km/h?
    Question

    How many seconds will a boy take to run one complete round around a square field of side 42 metres, if he runs at a speed of 12 km/h?

    A.

    47

    B.

    60

    C.

    50.4

    D.

    48

    Correct option is C

    Given:

    Side of square field = 42 metres

    Speed of boy = 12 km/h

    Formula Used:

    Distance around the square = 4 × side of the square

    Time =Distance  Speed \frac{\text{Distance }}{\text{ Speed}}​​

    Solution:

    Distance around the square = 4 × 42 = 168 metres

    Convert speed from km/h to m/s:
    12 km/h =12×10003600m/s \frac{12 \times 1000}{3600} \text{m/s}​​

    Time =16812×1000360050.4 seconds \frac{168}{\frac{12 \times 1000}{3600} } \approx 50.4 \, \text{seconds}​​

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