Answer: 13h 19min
Explanation:
At your friend's at 7:45pm
At your place at 9:22am
the drive home was 18 minutes.
----------------------------------------------------------
Start by subtracting those 18 minutes.
9:22am - 18minutes
9:04am
-----------------------------------------------------------
Now calculate the length of time between 7:45pm and 9:04am
Let's begin by making 7:45pm - 8:04pm; we can do this by adding 19 minutes.
Now we have to go from 8:04pm to 9:04am, I know this is 13 hours.
We are left with 13h 19min