Explanation:

- Amit's present age is \(\frac{5}{4}\) of his age at the time of his sister's marriage.

- His sister's marriage was 5 years ago.

- Let Amit's age at the time of his sister's marriage be \(x\).

- Therefore, Amit's present age is \(\frac{5}{4}x\).

- Since the marriage was 5 years ago, Amit's present age is also \(x + 5\).

- Equating the two expressions: \(\frac{5}{4}x = x + 5\).

- Solving for \(x\), we get \(x = 20\).

- Amit's age at the time of marriage was 20 years.

- Therefore, Amit's present age is 25 years.

- His father's age at that time was twice Amit's age, i.e., \(2 \times 20 = 40\).

- Father’s present age is \(40 + 5 = 45\) years.

Answer: Option:2, 45