The relative speed of the two trains moving in opposite directions is 54 km/h plus 36 km/h equals 90 km/h. Converting this speed to meters per second gives 90 multiplied by 5 divided by 18, which equals 25 m/s. The total distance covered by the passenger to observe the other train passing is relative speed multiplied by time, yielding 25 m/s multiplied by 8 s equals 200 m. Since the length of the second train is given as 200 m, it is the only distance considered, making the first train's length zero, which is impossible. Therefore, the question setup implies the length of the first train is asked but cannot be derived correctly from the given data, so the correct choice is none of the above.