CPU Time greater than Startup time

Hi List,

Maybe I'm too tired and I'm doing something wrong here.....I need some more 
eyes on it

Oracle 7.3.4.2
HPUX 10.20

SQL> select (sysdate - (to_date(a.value,'J') + (b.value/86400)))*24*60*60*100 
time_since_startup_cs
  2  from v$instance a, v$instance b 
  3  where a.key = 'STARTUP TIME - JULIAN' and
  4  b.key = 'STARTUP TIME - SECONDS';

 24502700

SQL> select name, value from v$sysstat where name like 'CPU%';

CPU used when call started                                        30712324
CPU used by this session                                          30731923


CPU used when call started is greater than time_since_startup_cs...how is that 
possible?
I'm sure I missed something.

thanks in advance
Diego.

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