Explanation:

- To find the distance, use the formula: Distance = Speed × Time.

- The train travels at a speed of 6 m/sec.

- Time traveled is 2 hours.

- First, convert time from hours to seconds: 2 hours = 2 × 60 minutes × 60 seconds = 7,200 seconds.

- Calculate the distance: 6 m/sec × 7,200 seconds = 43,200 meters.

- Convert meters to kilometers: 43,200 meters = 43.2 km.

- Therefore, the train covers 43.2 km.

- Option 4: 43.2 km is the correct answer.