Around the earth by Car

Earth's circumference around the equator is determined as 24, 902.4 miles roughly around 230 BC by the Greek historian and librarian of Alexandria, Eratosthenes .

If the circumference of earth was covered by land around the equator, then to travel around the earth would take the following calculation

assuming you travel at 50 mph and travel 12 hours daily , the total distance you could cover is 600 miles. It would take 41.50 days or roughly a month and 10 days to circumvent the earth.

Which is almost half of what Jules verne envisioned in Around the World in 80 days. It would only take a mere 25 mph drive to cover the world by car in 80 days.

I have personally travelled more than 600 miles a day for two consecutive days and this is very much possible to be acheived by most of us.

if the same distance were to be covered in a single day, it would require a vehicle which can do just more than 2000 mph (1037) and a drive continuously for 12 hours, which can be done only by MACH 3 vehicles (MACH 3 is three times the speed of sound).

Imagine the speedometers for such a car would read not between 10 to120 but would read twenty times more as 200 to 2400 mph in the dashboard. That brings us an interesting question of the speed of the car used in the Back to the Future movies.

This MACH 3 speed was acheived not in land but in air by the first flight, faster than three times the speed of sound occurred on 27 September 1956. The aircraft was the Bell X-2 and the pilot was Captain Milburn Apt at speed of 2094 mph.

The current aircraft speed is Mach 10 (ten times the speed of sound) acheived in Nov 2004.
The speed would be roughly 6800 mph and thus you can circumvent the earth roughly in 3.6 hours.