The points have the same x-coordinate, so they lie on a horizontal line. The distance between them is the difference between their y-coordinates.

The distance between the two points is 1.3.
Rewrite all 4 numbers as decimals to compare them:
88/25 = 3.52
3 11/20 = 3.55
Now arrange them in the correct order:
88/25, 3 11/20, 3.551, 3.88
So, lets solve this!
Time that you came at work= 6:30
Number of hours you need to work= 3
Time you leave= 6:30+3= 9:30
so, you leave at 9:30
Hope this Helps!