Question

how long would a boy take to walk once around a circular Park whose diameter is 420 M if his feet is 3 km per hour​

Answer 1

d = 420m

r = 210m

Speed = v = 3km/h = 10.8m\s

Circumference of the circle = 2πr

= 2*22\7*210

= 1320m

V = d\t

t = d\v

t = 1320\10.8

t = 122.22 seconds = 2.03 minutes