Explanation:

- The total number of employees is 200 with an average age of 58 years.

- 3/5 of the employees are male, which means 120 males (3/5 of 200).

- The remaining 80 employees are female.

- The ratio of the average age of males to females is 5:7.

- Let the average age of males be 5x and females be 7x.

- The combined average (5x for 120 males and 7x for 80 females) is equal to 58.

- Setting up the equation: (120*5x + 80*7x) / 200 = 58.

- Solving this, we get the average age of males (5x) as 50 years.

Option 1: 50 years is correct.