Distance = Rate * Time
so, algebraically,
Time = Distance/Rate
Time = 100 miles/75 mph
= 1.33 hours
.33 * 60 minutes = ~ 20 minutes
1 hour and 20 minutes
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Time = Distance/Speed = 10/75 = 0.133... hours = 8 minutes
4.8 hours. That is assuming you don't have to slow down or speed up during that time.
250/75 = 10/3 = 3 and 1/3 hours or 3.333 in decimal
Dividing the distance travelled by the speed gives 175/75 = 2.3 recurring (that is, 2.3333...) hours or 2 hours 20 minutes.
325 mi / 75MPH = 4.33 hr = 4 hr 20 min.