A boy runs round a square field of side 75 m at 9 km/h. How long does he take to complete one round?
Correct answer B. 120 seconds
Explanation
Perimeter = 4 × 75 = 300 m and speed = 9 × 5/18 = 2.5 m/s. Time = 300 / 2.5 = 120 seconds.
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