How long would 475 miles be in hours?

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This question cannot be answered sensibly. A mile is a measure of

distance, with dimensions [L]. An hour is a measure of time, with

dimensions [T]. Basic dimensional analysis teaches that in most

cases you cannot convert between measures with different dimensions

without additional information. There is no information on who or

what is travelling - a light beam? a snail? - or, if a person, by

what means - plane, train, walking?