Question

a cyclist goes around a circular track once every 2 minutes. If the radius of the circular track is 105 metres, calculate his speed

Answer 1

Hey

Given Radius 
= 105 \: m=105m 
Time 
=
2 \: min2min 

= 120 \: sec=120sec 
we know that 

circumference = 2πr 
⇒2×22/7×105
⇒ 660 m
∴ speed = distance / time 
⇒660 m/ 120
⇒5·5m/s

Hope it helps to you.

Answer 2

Hey

Given Radius
$= 105 \: m$
Time
=
$2 \: min$

$= 120 \: sec$
we know that

circumference = 2πr 
⇒2×22/7×105
⇒ 660 m
∴ speed = distance / time 
⇒660 m/ 120
⇒5·5m/s

Hope it helps to you.