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An athlete runs at a speed of 30 km/hr around a circular ground whose area is 2464 m2. How much time does he take to complete one round around the ground?

A.	25.25s	B.	21.12s
C.	20s	D.	22s

Answer and Explanation

Answer:21.12s

Explanation:
Area of the cicular ground = 2464m2 = pr2
r = 28 m
Circumference = 2* p*r = 2*p*28 = 175.93 m = distance covered by the athlete
Speed of the athlete = 30 km/hr = 8.33 m/s
Time = distance/speed = 175.93/8.33 = 21.12s

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