How to get the output table from input table ?

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SQL-Server-2005

SQL-Server

Below the input table

Number RevNumber State Time Stamp
10 1 10 8:00
10 2 10 8:15
10 3 15 8:35
10 4 20 9:00
10 5 20 9:55
10 6 20 15:45
10 7 30 20:00
10 8 30 20:15
10 9 40 21:00
10 10 50 22:00

How I get the below output table.Can someone provide me the sql to get the below table.The output table is below :-

Number RevNumber State TimeStamp GAP
10 1 10 8:00 0:35
10 2 10 8:15 0
10 3 15 8:35 0:25
10 4 20 9:00 11:00
10 5 20 9:55 0
10 6 20 15:45 0
10 7 30 20:00 1:00
10 8 30 20:15 0
10 9 40 21:00 1:00
10 10 50 22:00 12:20