None, because hours are a measurement of time and miles are a measure of distance If you travel at an average speed, say 50 miles per hour, it is different. Miles per hour is miles/hour example: if you do it this way 3321 miles divided by 50miles/hour the hour is 1 hour of course invert it and multiply (3321 miles) * 1 hour / (50 miles) the word "miles" cance out 3321/50 * 1 hour = 66.42 hours
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