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This question cannot be answered sensibly. A mile per hour is a measure of speed, while a minute is a measure of time. More information is required.
That depends on the speed. Pick a speed, then divide the distance by the speed. If you divide a distance in miles, by a speed in miles/hour, the answer will be in hours.
As many as are required
That depends on the speed. Assume a speed (in kilometers per hour), then divide the distance by the speed. Answer is in hours.
how many 12 in by 12 in pavers is required for30 square feet