Time = Distance/Speed = 6.15 hours approx.
This assumes that you can maintain an average speed of 65 mph for over 6 hours - quite an unlikely event.
about an hour
15mi/65MPH = .23 hr = 13.9 minutes.
19.5 mins
12 hours 2 minutes.
3 hours 13 minutes.
4 hours 16 minutes.
4 hours 41.5 minutes.
It should take 3 hours at 65mph.
1 hour 23 minutes.
6 hr 29 minutes.
roughly 6 hours and 40 minutes
2 hours 10 minutes.