How long would it take to drive around earth's equator? (earth's circumference ≈ 40,000 km if driving at 143km?

The distance traveled is the circumference of the earth (around the equator). This distance is

d = 40,000 km

The average traveling speed is

V = 143 km/h

Note: Speed cannot have units of 143 km, as given in the question.

Because distance = Speed * time, therefore

time = distance/speed.

The time taken to travel around the equator is

time = (40,000 km) / (143 km/h)

= 279.7 hours

Answer: About 280 hours (nearest hour)