It depends on how fast you are moving. If you are going 65 mph, the actual driving time at that speed (not including speed changes, stops or delays) would be: 13 hours 50 minutes 46 seconds.
900/75 = 12 hours
15 hours
Fifteen hours of course !
10 hours 35 minutes.
12 hours exactally.
900/60 = 15 hours
At 60 MPH average, about 15 hours.
It would take: 900/45 = 20 hours
Assuming you make no stops, 12 hours.
This cannot be answered properly without knowing how fast you are traveling.
900 miles / 50 miles/gallon = 18 gallons
About 900 miles via Amarillo, Abuquerque and Flagstaff.