There are 60 minutes in 1 hour, so if we add 30 minutes we get 11:68, and becuase we know that there are 60 minutes in 1 hour.
We can get 12:08 from this time. 12:38 p.m
To solve this problem, do this...
11:38 A.M. + 1 hr = 12:38 P.M.
12:38 P.M. - 30 min = 12:08 P.M.
12:08 P.M. is the answer.
~~Hypotenuisance