Answer:

Let Ronit's present age is x

Then father's present age is 3x

According to the question after 8years

(3x+8)=2.5(x+8)

3x-2.5x=20-8

0.5x =12

5/10x=12

X=12×10/5

X=24

Ronit's present age 24

His father's present age

3x=3×24

=72

Again after 8years Ronit's age will be 24+8=32

Ronit father's age 72+8=80 which is 2.5 times than his son