Answer:
364.5 m
Step-by-step explanation:
Initial speed = u = 27 m/s
Acceleration = a = -1 m/s²
Distance = s

Time taken = t

So, in 27 seconds the train will stop and will have travelled a distance of 364.5 m.
So, the rest of the 27 seconds it will not move.
Hence, the distance covered in 54 seconds will be 364.5 m.