This question cannot be answered sensibly. Miles per hour is a measure of speed, with dimensions [LT-1]. A second 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.
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Traveling 100 meters in 80 seconds equates to an average speed of 2.79 miles per hour.
If you traveled at a constant rate of 75 miles per hour for 115 miles, it would take you 1.533 hours or 1 hour and 32 minutes. 1.533 hours is equal to 5520 seconds.
It is: 24*60*60 = 86,400 seconds
1 hour = 60 minutes 1 minute = 60 seconds 1 hour = 60 x 60 seconds = 3600 seconds
(1 mile / 75 seconds) x (3,600 seconds / hour) = 48 miles per hour