Explanation:

- Let's start by understanding the problem.

- 28% of the students can't speak either Hindi or English. So, 72% of students can speak at least one of the languages.

- Define the total percentage of students as 100%.

- Given: 60% speak Hindi and 70% speak English.

- Use the formula for finding those who speak both languages:

$$\text{Percentage who speak at least one language}=\text{Percentage who speak Hindi}+\text{Percentage who speak English}-\text{Percentage who speak both languages}$$

So, 72% = 60% + 70% - both

- Solving, we get: both = 60% + 70% - 72% = 58%

- This means 58% of students speak both languages.

- Option:3, 58% is the correct choice.