To determine how much time it takes to travel a certain mileage you multiply the distance times the speed of the driver or the assumption of the term 60 miles to an hour. So if you are traveling 10 miles an hour it would take you 150 minutes to arrive. Which is 2 and 1/2 hours since every hour is 60 minutes and 60 X 2 is 120 and you have a remainder of 30 which is a half an hour.
The amount of time it takes to drive 150 miles depends on how many miles per hour one is driving. If this is all done on the highway, which is on average driven at 60 milers per hour, it would take about two and a half hours, with 60 miles done every hour.