Question

A boy takes 20 minutes to cover the distance of the boundry of a circular park at a speed of 70m/min. Find the radius of the park.

Answer 1

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given= t = 20 min,,

v = 70m/min..

then we have,,,

distance = 2πr,,

given,

v = 2πr/t

70 = 2× 3.14 ×r/20

r = 222.92 m,,,,

that is,,

radius of the circular boundary is 222.92m

Answer 2

Answer:

Step-by-step explanation:

1) time taken by the boy to cover the distance=20 mins.

2)speed of the boy=70m/s

3)Since, the boy is moving along the boundary of a circular track

Therefore, distance=2×pie×radius

4)speed=distance/time

5)70=(2×22/7×radius)/20

(70×7×20)/2×22=radius

222.72m=radius