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In Europe, car is rarely the best way to move around.

Thalys high-speed trains get you from Paris to Amsterdam in 3h; add another hour to move to/from the train stations, and here are your 4 hours.

The presentation does not specify by car. It does take pretty much 4h by train.

It's presumably by train since the estimates are written on train tracks.

And yes, the 4h figure is for travelling by train, not by car.