Final answer:
The time it takes to reach the railroad station at a speed of 4 mph cannot be determined without knowing the distance to the station. Once the distance is known, the time can be calculated using the formula: time equals distance divided by speed.
Step-by-step explanation:
The student's question pertains to calculating the time it takes to reach the railroad station at a given speed. However, in order to calculate the time, we need to know the distance to the station. The formula for time is Distance divided by Speed. Since only the speed is given (4 mph), without the distance, we cannot calculate the time. If the student provides the distance to the station, we can use the formula:
Time (hours) = Distance (miles) / Speed (mph)
For example, if the station is 4 miles away, then at a speed of 4 mph, it would take 1 hour to reach the station.