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 you cannot convert between measures with different dimensions such as these without additional information, such as mode of transport.
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If you mean that travelling at 26.6 miles per hour, how long you would travel in 4 hours, you would travel 106.4 miles in 4 hours.
73 / A = hours of travel time
To travel 145 miles in 3.5 hours requires an average speed of 145/3.5 mph. The distance traveled at this speed for 5 hours would be approximately 207 miles (5 x 145/3.5 miles).
It depends on the speed at which you travel.
It would not take an hour to travel four miles by plane.. It would be mere minutes