900/75 = 12 hours
15 hours
It would take: 900/45 = 20 hours
Fifteen hours of course !
12 hours exactally.
At 60 MPH average, about 15 hours.
This cannot be answered properly without knowing how fast you are traveling.
Assuming you make no stops, 12 hours.
About 900 miles via Amarillo, Abuquerque and Flagstaff.
The total distance is 900 miles. The journey would take about 12 hours and 41 minutes.
900/60 = 15 hours
10 hours 35 minutes.