SQL - How to compare 2 time values in varchar?

I have a table1 containing the following fields:
StartHour int
StartMinute int
EndHour int
EndMinute int

so if an event started at 2:30 and ended at 3:00, the table would have values:
StartHour = 2
StartMinute = 30
EndHour = 3
EndMinute = 0

I want to be able to get the difference between start time and end time:
diff(2:30, 3:00)

Suggestions?
Thx.
fippifAsked:
Who is Participating?
 
Kevin CrossChief Technology OfficerCommented:
Since your data is stored in integers, I would just do simple math in minutes.

SELECT (EndHour * 60 + EndMinute) - (StartHour * 60 + StartMinute)  AS DiffTimes
FROM Table1
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