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I want to ask that there is a formula for km /h ? Most of the time I notice that 5/18 is used. For example 90 km/h = 90 × 5/18. Please tell me why 5/18 is used.

Answer» I want to ask that there is a formula for km /h ?
Most of the time I notice that 5/18 is used.
For example 90 km/h = 90 × 5/18.
Please tell me why 5/18 is used.


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