Time in APEX

I want to add two fields. "Start Time" and "Finish Time" and then have another field which displays the actual time by subtracting the finish time from the start time. I can't find a format for time, there is a date which includes the time but not time by itself. If you use a number then 5.30 is 5.3 not 5.5 in hours.
Any ideas?

Thankyou for the reply Varad.
How would I incorporate the code into the query below. I need to calculate the difference between 'DEPARTURE_TIME - 'ARRIVAL_TIME' and 'FINISH_TIME - START_TIME'
select "ID","ENGINEER","DATE_OF_CALL","ARRIVAL_TIME","START_TIME","FINISH_TIME","DEPARTURE_TIME","COMPLETE","FAULT_CODE","PARTS_ON_SITE","PARTS_VAN","FAULT_LOCATION_CODE","METER_101","METER_108","METER_122","METER_123","METER_112","METER_113",dbms_lob.substr("COMMENTS",4000,1) COMMENTS
from "DPSG_FVR"
where
instr(upper("COMPLETE"),upper(nvl(:P1_REPORT_SEARCH,"COMPLETE"))) > 0 or
instr(upper("ENGINEER"),upper(nvl(:P1_REPORT_SEARCH,"ENGINEER"))) > 0 or
instr(upper("FAULT_CODE"),upper(nvl(:P1_REPORT_SEARCH,"FAULT_CODE"))) > 0 or
instr(upper("PARTS_ON_SITE"),upper(nvl(:P1_REPORT_SEARCH,"PARTS_ON_SITE"))) > 0 or
instr(upper("PARTS_VAN"),upper(nvl(:P1_REPORT_SEARCH,"PARTS_VAN"))) > 0 or
instr(upper("FAULT_LOCATION_CODE"),upper(nvl(:P1_REPORT_SEARCH,"FAULT_LOCATION_CODE"))) > 0
)

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