in maths , ratio means the comparision of two quantities of the same unit.the sign for ratio is is pronounced as is to.

in maths , rate means  a ratio between two measurements with different units.
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Rate means to compare to different units of measurement or a ratio that compares two quantities of different units. Example: A car goes 100 miles in 1.5 hours, what is the rate?
A ratio is a quantity that denotes the proportional amount or magnitude of one quantity relative to another. Example: The ratio of apples to oranges is 5 to 3 (or 5:3 or 5/3)
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