Time = Distance/Speed = 1800/75 = 24 hours.
However, that assumes you can maintain an average speed of 75 mph for such a long time even after allowing for fuelling stops, comfort stops, swapping drivers, etc. My guess is that if you try to average 75 mph you will probably spend some time in a police station (if not worse) and so take a lot more than 24 hours!
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Depends on speed.
At 70.06 mph, it will take an hour.
4.8 hours
26 minutes.
About 52 minutes.