Final answer:
The formula to calculate speed is Distance / Time. Plugging in the given values, the speed of the train is 150 miles per hour if it travels for 4 hours.
Step-by-step explanation:
The formula to calculate speed is:
Speed = Distance / Time
In this case, the distance is 600 miles and the time is 4 hours. Plugging in these values into the formula:
Speed = 600 miles / 4 hours
Speed = 150 miles per hour
Therefore, the speed of the train is 150 miles per hour if it travels for 4 hours.