It takes a continent approximately 250,000,000 years to move halfway around Earth, a distance of about 19,200 km or 1,920,000,000 cm. The speed of the
continent in
per
can be found by dividing 1,920,000,000 cm by 250,000,000 years.
1,920,000,000 cm / 250,000,000 years = 7.68 cm/year
So, the speed of the continent moving halfway around Earth is 7.68 cm/year.