Final answer:
The acceleration of the train is 1 km/h/s.
Step-by-step explanation:
To calculate acceleration, we use the formula:
acceleration = (final velocity - initial velocity) / time
In this case, the initial velocity is 30 km/h, the final velocity is 45 km/h, and the time is 15.0 seconds. Plugging these values into the formula:
acceleration = (45 km/h - 30 km/h) / 15.0 s = 1 km/h/s
Therefore, the acceleration of the train is 1 km/h/s.