Time diffrence different rows

Hello,

I'm not sure if this is the correct forum, but ill give it a try!
This is the response of a query:

[PROCES] [ID] [DATE] [STATUS]
Proces A 925808352 19-07-2010 13:51:31 Started
Proces A 925808352 19-07-2010 13:51:35 succesful
Proces B 925808353 19-07-2010 13:51:36 Started
Proces B 925808353 19-07-2010 13:51:37 succesful
Proces A 925808354 19-07-2010 13:51:39 Started
Proces A 925808354 19-07-2010 13:51:45 succesful

Is it possible to calcualte the time diff (in sec) between de unique id's (started/succesful)?
Maybe with a computed column?

Thanks in advance,

Sjoerd