It will depend entirely on how fast you drive and the route you are taking. If you go 78 miles an hour on a nice straight highway, it will take one hour.
Realistically, a 78 mile drive will take about an hour and a half to two hours.
8
1 hour 18 mins at 60 mph
It took me 78 min
8 hours 46 minutes.
4 hr 9 min.
1 hour 24 minutes.
1 hour 18 minutes
Time = Distance/Speed = 78/75 = 1.04 hours
1 hour 2 minutes and 24 seconds.
This cannot be answered properly without knowing what your speed is.
1 hour 25 minutes.
9.23 Hours - or just under 9 hours 15 minutes.
7 and 2/3 hours (i.e 7 hours 40 minutes)