Explanation:

- Two trains are moving towards each other. One travels at 25 m/s, the other at 75 m/s.

- They meet after train A has traveled 360 km more than train B.

- Speed ratio is 1:3 (since 25 m/s and 75 m/s are in the ratio 1:3).

- When one train travels a certain distance, the other travels three times that distance.

- The extra 360 km is due to this difference in speed.

- Calculate based on speed and meeting condition: \( \text{Train A's distance} = x + 360 \) km, \( \text{Train B's distance} = x \) km.

- 3x = x + 360 km, solving gives x = 180 km; total distance is x + x + 360 km = 720 km.

- Correct Option: Option 2: 720

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