The definition of linear velocity is: arc length per unit time, linear velocity = arc length? The time required to walk through this arc length

V = liter/ton

So, linear velocity = circumference? Period (time for one revolution)

Circumference = 2π r = π d (d is the diameter)

V = 2π r/t = π d/t

Period = time? Number of laps? T=60/x

You have the above formula.