Ignore the title, the feat was changed.[]
"Traveling in the new world was a breeze. You could get in a car and fly from the north pole to the south pole in a few seconds."
Seems pretty straight forward.
Distance from one pole to the other is is 12440.01 miles (20020255.453 meters)
Since the time it takes is not specified beyond "..a few seconds", I will use 3 different timeframes: 10 seconds, 30 seconds, and 50 seconds. I will then average all the results together to get a result.
High End (10s): Mach 5836.8 (Massively Hypersonic+)
Mid End (30s): Mach 1945.6 (Massively Hypersonic+)
Low End: (50s): Mach 1167 (Massively Hypersonic+)
After adding all of these together and dividing by 3, I get a final result of Mach 2983 (Massively Hypersonic+)
Final Results: Mach 2983 (Massively Hypersonic+)