"time" for a timesheet.

I'm working on a time sheet to be used by co-workers and self. In column "F" the start time is keyed in by the user, and in column "G" the stop time is entered by the user. I would like to find a formula for column "H" that would display the time for each job & time entry. Column's "F" & "G" are in 24 hr format (13:30, etc) and column "H" would need to display the time for each job in hours & tenths such as: 13:30 - 14:42 = 1.2
I've been banging my head on this one so any help would be much appreciated! Thanks in advance for any help that can be provided.
Steve