```
Time = Distance / Speed
```
In this case, the distance is 310 miles and the speed is 75 mph. So, the time to drive 310 miles at 75 mph can be calculated as:
```
Time = 310 miles / 75 mph = 4.13 hours
```
Therefore, it will take 4 hours and approximately 8 minutes to drive 310 miles at 75 mph.
