In that case, we can use the formula: Driving time = Distance / Speed
Driving time = 315 miles / 60 mph
Driving time = 5.25 hours
Therefore, it will take approximately 5 hours and 15 minutes to drive 315 miles at a steady speed of 60 mph.
Please note that this calculation doesn't factor in any potential traffic delays, stops for gas or bathroom breaks, or varying speed limits along the route.