Five years ago, the ratio of the age of A and B is 11 : 20. After 5 years, the ratio of the age of A and B is 16 : 25. After 'x' years from now, the age of B will become 1.5 times to the age of A. Find the value of 'x'.
1
5 years
2
8 years
3
18 years
4
9 years