The ratio of French and Fries’ present age is 3 ∶ 2, and the ratio of French and his daughter’s present age is 3 ∶ 1, and the ratio of Fries’ and his son’s present age is 5 ∶ 1. If the product of French’s daughter age and Fries son age is 360, then find age difference of French and Fries.
1
30
2
20
3
15
4
18
5
None of these