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Subtracting rows as opposed to columns

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Last Modified: 2013-12-02
I have a table that holds the end time, activity id, record number. What I need to do is subtract record 2's time from record 1' time, record 4's time from record 3's time.

table data
started      activity Id      record Id
11/14/2013 11:06:29 PM      1257      1
11/15/2013 2:09:57 PM      1291      2
11/18/2013 4:26:34 AM      1257      3
11/18/2013 4:48:53 PM      1291      4
11/19/2013 2:54:52 AM      1257      5
11/19/2013 3:42:00 PM      1291      6
11/21/2013 2:24:38 AM      1257      7
11/21/2013 2:08:06 PM      1291      8

I have no idea how to do this, can someone please assist.
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