Answer with Explanation:

Let Ronit's present age be x years.
Then,
Father's present age =(x + 3x) years = 4x years.

(4x + 8) = 5/2 (x + 8)

=> 8x + 16 = 5x + 40

=> 3x = 24

=> x = 8.

Hence, Required ratio  = (4x + 16)/(x+16)
                                      = 48/24
                                      = 2.