How many seconds will a boy take to run one complete round around a square field of side 38 metres, if he runs at a speed of 6 km/h?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e 91.2.
Side of square field = 38 m
So, Perimeter = 4 × 38 = 152 m
Speed = 6 km/h
Convert to m/s = 6 km/h = (6 × 1000) / 3600 = 5/3 m/s
Time = Distance / Speed = 152 ÷ (5/3) = 152 × (3/5) = 91.2 seconds