Correct Answer - Option 3 : 56 sec
GIVEN:
Side of the square field = 35 m and speed of the boy = 9 km/hr = 9 × 5/18 = 2.5 m/s
FORMULA USED:
Perimeter of the square = 4 × Side and Distance = Speed × Time
CALCULATION:
Perimeter of the square = 4 × Side
⇒ 4 × 35
⇒ 140 m
Distance covered = Perimeter of the square field = 140 m
⇒ Time taken = Distance/Speed
⇒ Time taken = 140/2.5
⇒ 56 sec
∴ Time taken to run around the square filed = 56 sec
