Question

A person swins 100m in first 40s ,80 m in next 40s and 45m in last 20s what is the average speed ?

Answer 1

Average speed = Total distance /Total time
V = (100 + 80 + 45) / (40 + 40 + 20)
V = 225/100
V = 2.25 m/s

Average speed of that person is 2.25 m/s

Answer 2

$\displaystyle Distance = 100m + 80m + 45m\\ Distance = 225m\\ Time = 40s + 40s + 20 s\\ Time = 100s\\\\\text{we know'}\\Avg.Speed = \frac{total distance}{total time}\\ Avg.Speed = \frac{225}{100}\\Avg.Speed = 2.25 m/s$ @duragpalsingh