Final answer:
The distance from Carville to Plainsbrough is 315 miles. Traveling at 60 mph instead of 70 mph, the trip would take 5.25 hours or 5 hours and 15 minutes. The correct answer is not listed in the options provided, suggesting there may be an error in the question.
Step-by-step explanation:
The question asks how long it will take to travel from Carville to Plainsbrough at a different speed. Originally, the trip takes 4.5 hours at 70 mph. First, we need to calculate the total distance covered using the initial speed and time. The distance (D) is calculated as speed (S) multiplied by time (T), which is:
D = S × T
D = 70 mph × 4.5 hours = 315 miles
Now, we need to calculate the time it would take to cover this distance at 60 mph. Using the formula for time, which is distance divided by speed:
T = D / S
T = 315 miles / 60 mph = 5.25 hours
Therefore, the trip would take 5.25 hours, which is equivalent to 5 hours and 15 minutes, when traveling at a constant speed of 60 mph.