Thanks Friends,
I figured like below :
Select a.Sent, b.Recd, (Extract Minute from b.Recd-a.Sent) DIFF
from TableA a, TableB b
where b.type = 'AAA'
and b.ID = a.ID1;
Where " (Extract Minute from b.Recd-a.Sent) DIFF" returns the date difference in MINUTES