Question

a cyclist goes one round crcular track of diameter 105 m in 5 min. calculate his sped

Answer 1

d=105m
r=52.5m
circumference of circle=2πr
=2×3.14×52.5
=329.7
t=5min=5×60sec=300sec
speed=total distance÷total time
=329.7÷300
=1.099m/s

Answer 2

diameter = 105 m
distance travelled = πD = 22/7 × 105 = 330 m
time = 5 minute = 300s

speed = 330/300 = 1.1 m/s