Question

a cyclist goes once round a circular track of diameter 105 metre in 5 minutes calculate his speed

Answer 1

distance travelled by cycle=circumference of circle=2πr=πd
here d=105m
t=5*60=300s
speed=distance/time
=105/300
=0.35m/s

Answer 2

GIVEN:

Diameter=105 metre

Time=5 minutes

Speed=Distance/time

Distance=Circumference of circle= 2πr

=2×22/7×105/2=

330m

t= 5 minutes

5×60=300 seconds (SI Unit of speed is m/s)

Speed=330/300

=1.1m/s