Engineering Mechanics
The velocity ratio of a differential wheel and axle with 'D' as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is

2D/(d₁ - d₂)
D/(d₁ - d₂)
D/(d₁ + d₂)
2D/(d₁ + d₂)

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