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    Swarna runs at a speed of 10 km/h. How long will she take to cover 200 m?
    Question

    Swarna runs at a speed of 10 km/h. How long will she take to cover 200 m?

    A.

    120 seconds

    B.

    54 seconds

    C.

    90 seconds

    D.

    72 seconds

    Correct option is D

    Given:

    - Speed of Swarna = 10 km/h

    - Distance to be covered = 200 meters

    Formula Used:

    Use the formula: Time = DistanceSpeed\frac{Distance }{ Speed}​​

    Ensure that the units of distance and speed are the same.

    Solution:

    Convert speed from km/h to m/s:

    1 km/h =518 \frac{5}{18}​ m/s

    So, 10 km/h = 10×518=501810 ×\frac{ 5}{18} = \frac{50}{18}​ m/s

    = 200(5018)=200×1850\frac{200 }{ (\frac{50}{18})} = 200 × \frac{18 }{ 50 }​= 72 seconds

    Swarna will take 72 seconds to cover 200 meters

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