Distance = rate * time. (55 miles/hour) * (4 hours) = 220 miles
65 miles per hour x 4 hours = 260 miles
75 minutes is 1.25 hours. going 14.6 miles each hour means you multiply 1.25 by 14.5 and you get 18.125
At 10 miles an hour it will take you 179.7 hours to cover that distance. At 100 miles an hour it will take you 17.97 hours to cover that distance.
It will take 0.54 hour to cover 38 miles going by 70 miles per hour.
You cover 31.25 miles.
As many as you want to, if you're willing to keep at it. The distance you can cover is (25) x (the number of hours you keep going).
70 miles/hour * 7 hours = 490 miles
If you're going 40 miles per hour, it will take 1 hour. If you're going 20 miles per hour, it will take 2 hours. If you're going 10 miles per hour, it will take 4 hours. If you're going 80 miles per hour, it will take 30 minutes.
The number of miles you would cover if you traveled for 8 hours at 70 miles per hour is a simple math problem. Simply multiply 70x8 to get an answer of 560 miles.
800 miles / 16 miles per hour = 50 hours