Final answer:
To reach the destination, it will take 6 hours of driving at 60 miles per hour for the remaining 360 miles.
Step-by-step explanation:
If you have already driven 120 miles and need to drive a total of 480 miles, you have 480 - 120 = 360 miles left to travel. Since you are driving at a speed of 60 miles per hour, we can calculate the time remaining to reach your destination by dividing the remaining distance by your speed. So, 360 miles ÷ 60 miles per hour = 6 hours.