This question cannot be answered sensibly. An hour is a measure of time, with dimensions [T]. A mile is a measure of distance, with dimensions [L]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information, such as speed or mode of transport..
It travels 100 miles in 2.5 hours.
Time = Distance/Speed = 1180/100 = 11.8 hours
25
21 hours.
100 miles.
about 100 miles
100 miles / 4 hours = 25 miles per hour.
It depends on the speed. At 10 miles per hour 100 miles is 10 hours. At 100 miles an hour it is 1 hour. At 1000 miles an hour it is 0.1 hour (= 6 minutes).
2.5 * 40 = 100 miles
100 miles
About 1.5 hours at an average of 65 mph.
Seriously. No one knows?