Question

A cyclist once goes around a circular track of diameter 210m in 10 mins.Calculate its speed ​

Answer 1

Answer:

1.1 m/s

Explanation:

diameter  d= 210m

radius  r= 210/2

         = 105m

perimeter of circle = 2πr

                               = 2*22/7*105

                               = 660m

time t = 10mins = 10*60 sec

                         = 600 s

velocity (or) speed = perimeter / time

                               = 660 / 600

                               = 1.1 m/s

Answer 2

Explanation:

Diameter of the track=210m

length of the circular track=circumference of the circle

=diameter*π

=210*22/7

=660m

So 660meter is the circumference of the circle and also the distance covered by the cyclist.

Distance=660meters

Time taken=10min. or 600seconds

Speed=Distance/time

Speed=660/600

Speed=1.1 meter per second

if we want to convert it in kmph

we multiply it 18/5

so,

1.1*18/5

=3.96 kmph.