Define Continental Drift

the gradual movement of the continents across the earth's surface through geological time.

V = - 0.5 [m/s]

Explanation:

In order to solve this problem, we must use the principle of relative speeds. This is for an observer who is on the edge of the river he can see how the river moves to the left and the woman tries to move to the right but can not since:

That is, the person sees how the woman moves to the left but with avelocity of 0.5 [m/s] to the left