Explanation:

- The class has 60 students.

- 40% of the students are girls, which means there are 24 girls (40% of 60).

- Therefore, there are 36 boys (60 total - 24 girls).

- The average weight of all 60 students is 59.2 kg.

- The total weight of all students is 60 × 59.2 kg = 3,552 kg.

- The average weight of the 24 girls is 55 kg.

- So, the total weight of the girls is 24 × 55 kg = 1,320 kg.

- Subtract the total weight of the girls from the total weight of the class to find the total weight of the boys: 3,552 kg - 1,320 kg = 2,232 kg.

- The average weight of the boys is 2,232 kg / 36 = 62 kg.

The correct answer is Option 1: 62 kg.