1. The problem states a train is running at a speed of 1500 km per hour. 2. We need to find the actual time it takes to travel the first 1500 km. 3. Time is calculated using the formula $$\text{time} = \frac{\text{distance}}{\text{speed}}$$. 4. Here, the distance is 1500 km and the speed is 1500 km/hour. 5. Substitute the values: $$\text{time} = \frac{1500}{1500} = 1$$ hour. 6. Therefore, the train takes 1 hour to travel the first 1500 km.