60 mph = 1 mile per min therefore 30 mph = 0.5 miles min thus 455mlsx2 = 910 mins or 910mls/60mins = 15hrs 4mins
That is not quite correct and also it is simpler to divide distance by speed (using same units).
455/30 = 15.16666666etc hrs = 15 hrs 10 mins.
10.5
going 60 miles an hour
It would take 12 minutes to drive 20 miles at 100 mph.
601/60=10.0166 It would take 10.0166 hours to drive the 601 miles.
It would take about 46 minutes to drive 50 miles.
6 hours
About 6 hours
Depends on the speed
Depends on your speed.
2000 miles
That depends on your speed.
About 5.5 hours.