What is the time taken by Mohan to cover one round of a circular park of diameter 420 m, if he walks at a speed of 9 km/h ?
Answer & explanation
Correct answer: option 1
Diameter of a circular park = 420 m
Radius of a circular park = 210 m
Circumference of circle = 2Πr
= 2 × \(\frac{22}{7}\) × 210
= 1320 m
So , Distance = 1320 m
Speed = 9 km/h
9 km/h = 9 × \(\frac{50}{3}\) m/min = 150 m/min
Speed =150 m/min
Time = \(\frac{Distance }{Speed}\) m/sec
T = \(\frac{1320 }{150}\) m/sec
T = 8.8 min
So , Time taken by a person to cover one round of circular park is 8.8 min.