Explanation:

- Distance Traveled: The train is 800 meters long.

- Time Taken: It crosses the pole in 15 seconds.

- Speed in meters per second (m/s): Speed = Distance/Time = 800 m/15 s = 53.33 m/s.

- Convert to km/h: Multiply by 3.6 (since 1 m/s = 3.6 km/h): 53.33 m/s * 3.6 = 192 km/h.

- Option Verification:

1. 192 km/h – matches the calculated speed.

2. 156 km/h – does not match the calculated speed.

3. 174 km/h – does not match the calculated speed.

4. 210 km/h – does not match the calculated speed.

Answer: Option 1, 192 km/h, is the correct speed of the train.

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