Question

If humans originated in Africa and migrated to other parts of the world, some time would be required for this to occur. At the modest rate of one kilometer per year, how many centuries would it take for humans originating in Africa to travel to China, some 10,000 Kilometers away?

Answer 1

1 × 10² centuries

Explanation:

Given data

• Distance traveled (d): 10,000 kilometers

• Rate of travel (r): 1 kilometer per year

The rate of travel is equal to the distance traveled divided by the time elapsed (t).

r = d/t

t = d/r = 10,000 km / (1 km/y) = 10,000 y

1 century is equal to 100 years. 10,000 years are:

10,000 y × (1 c/ 100 y) = 100 c = 1 × 10² c

Answer 2

(10,000 km)/(1 km/yr) * (1 century)/(100 yr) = (10,000/100) centuries
= 100 centuries