Explanation:

To determine the time taken to cover the distance, we can use the formula:

- Time = Distance / Speed

First, let's convert the speed from meters per second to kilometers per second:

- 25 m/s = 0.025 km/s

Now, calculate the time:

- Time = 7.5 km / 0.025 km/s = 300 seconds

Convert seconds to minutes:

- 300 seconds = 5 minutes

Let's review the options:

- Option 1: 6 min - Incorrect, less than the calculated time.

- Option 2: 7.5 min - Incorrect, more than the calculated time.

- Option 3: 5 min - Correct, matches the calculated time.

- Option 4: 8 min - Incorrect, more than the calculated time.