Question

A Cyclist completes 5 rounds of a circular track of radius 21metres in 12minutes calculate the speed

Answer 1

Total distance travelled=5 × 2×pi×radius
=>x=10×22/7×21
=>x=10×22×3
=>x=660 m

Total time taken=12 min=720 sec

So speed = 660/720 = 11/12 m/s

PLZ MARK IT AS BRAINLIEST..

Answer 2

The radius of track = 21m

Circumference = 2πr

= 2×22/7×21

= 2×22×3

=132m

Total distance travelled = 5 × 132m
= 660m

Time taken = 12minutes = (12×60) seconds
= 720 sec

Speed = Distance/Time
= 660/720
=66/72
=33/36
=11/12 m/s

Answer) Speed of cyclist is 11/12m/s.