Answer :
Given : Mr . Gopinath is 30 years older than his son .
Let age of son = x , So
Age of Mr . Gopinath = x + 30
And
from second condition we get
2x + 11 = x + 30
x = 19
So,
Age of son = 19 years
And
Age of Mr . Gopinath = 19 + 30 = 49 Years ( Ans )