Explanation:

- The train crosses a stationary pole in 18 seconds. The time taken here indicates the length of the train alone.

- When the train crosses the bridge in 44 seconds, this time includes both the length of the train and the bridge.

- The length of the bridge is given as 650 meters.

- The time ratio for crossing the pole and the bridge can be used to determine the length of the train.

- The ratio of times to cross the bridge to the pole is 44:18.

- So, the train crosses an additional 650 meters (the bridge) in 44 - 18 = 26 seconds.

- Using this, the train's length can be calculated as: (Train length/18) = (650/26).

- Solving gives the train's length as 450 meters.

- ?? Correct Answer: Option 3 - 450m

“”