VR = dE/dL
Circumference of drive circle = π x d = π x .34m (thats pi btw)
Circumference of rear wheel = π x 0.7m
Gear ratio of wheels: for every time the front drive spins one the back wheel will spin 50/20 times or 2.5 times ( this is due to the gear ratio)
∴ VR = π x 0.34 / 2.5 x π x...