Question

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

Answer 1

Formula for speed = distance /time
Here the time is given 5 min
We need to have the distance
For distance
Perimeter of the circular track
2pie r =2*22/7* radius of track
Radius =diameter/2
Here the diameter is 105m
Therefore 2*22/7*105/2
Distance =330 mper2
Now for speed
But the unit of time is not according to the unit of distance...we need to convert it into sec
1min =60 sec
5min=5*60=300 sec
Speed=330/300 =1.1m/sec

Answer 2

Speed=Distance×time.105×5=525.