600, 125, 30, ?, 7.2, 6.44, 6.288

Direction: What should come in place of the question mark in each of the following number series ?

Series pattern
600/5 + 5 = 125
125/5 + 5 = 30
30/5 + 5 = 11
Should come in place of '?'
11/5 + 5 = 7.2
7.5/5 + 5 = 6.44
6.44/5 + 5 = 6.288