Define velocity ratio of a machine. Why it has no unit?

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Solution

Velocity ratio is defined as the ratio of the velocity of effort to the velocity of load in an equal interval of time.
Velocity ratio = $\frac{v e l o c i t y o f e f f o r t}{v e l o c i t y o f l o a d}$ .
It has no unit because it is the ratio of the same quantities having the same unit.

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