|This is another depiction of the Mid-Atlantic-Ridge. It is a portion of an image from the USGS site and a part of their discussion of plate motions.
The extent of separation associated with the Mid-Atlantic Ridge is about 5600 km and the extreme separation exhibits an age of about 180 million years. This gives an average velocity of separation of about 3.1 cm/yr with relative rates scaled from 2.8 to 4.4 cm/yr. The current rate of spreading is about 2.5 cm/year, showing general consistency with the overall distance and measured time.