To simplify this expression, we can first convert the fractions to have a common denominator.

4.8 = 48/10
0.2 = 2/10
1.8 = 18/10
3/5 = 6/10

Now we can rewrite the expression as:

(48/10) / (2/10) - (18/10) - (6/10)

Now we can perform the division and subtraction:

(48/10) / (2/10) = 48/2 = 24
24 - 18 - 6 = 0

Therefore, the result is 0.