Question

A body goes once around a circular track of diametre 105m in 5 minutes. Calculate its speed.

Answer 1

d is 105 m 
r will be 52.5m
circumference will be 2 × 22 ÷ 7 × 52.5 which is 330m 

time is 5min which is 5 × 60 = 300 sec
speed = distance upon time 
330 ÷ 300 
1.1 m/s

Hope This Helps.

Answer 2

Hi !

Radius = r = 52.5m
Distance travelled = circumference of the circle 
                              = 2πr
                              = 2*3.14*52.5
                              = 329.7m
                              = 330 m (approx.)

Time = t = 5 min = 5*60 = 300 sec

Speed = distance/time
           =330/300
           = 1.1 m/s

Hope this helps you !