EXPLANATION
Given the falling body equation:

Substituting for t=6:

Computing the power:

Multiplying numbers:

Now, substituting for t=6.2:

Computing the power:

Multiplying numbers:

Hence, the solutions are:
For t= 6s ---> h=576 ft
For t= 6.2s ---> h= 615.04 ft
Subtracting both distances:

Hence, the body will fall ≈ 39 ft between those seconds.