Obviously the data depends. But in places with a well-working train system, no matter what you do, the car is heavily inferior.
For example, Kiel-Berlin is 4 hours by car, assuming no traffic. Or around 1 hour 30 by train, which runs every 30 minutes. Getting to and from the station to any place in each city is another 30 minutes, in the worst case.
So the worst case scenario door-to-door train travel time is the same as the best case scenario door-to-door car travel time. And the comfort in a train is much nicer (so much leg space, and you can walk around, and eat stuff, and use a laptop nicely, just look at this: [1])
For example, Kiel-Berlin is 4 hours by car, assuming no traffic. Or around 1 hour 30 by train, which runs every 30 minutes. Getting to and from the station to any place in each city is another 30 minutes, in the worst case.
So the worst case scenario door-to-door train travel time is the same as the best case scenario door-to-door car travel time. And the comfort in a train is much nicer (so much leg space, and you can walk around, and eat stuff, and use a laptop nicely, just look at this: [1])
[1] https://www.fotosvonunterwegs.de/wp-content/uploads/2017/03/...