7:43 plus 36 minutes
STEP 1:
Add the minutes together (not hours) 
=43 + 36
=79 minutes 
STEP 2:
1 hour= 60 minutes
since there are only 60 minutes in an hour, add one hour to 7 above and subtract 60 from step 1 to find remaining minutes
=79 - 60 
=19 minutes
STEP 3:
add another hour to 7 since we have an extra 60 minutes 
=(7 hours +1 hour) + 19 minutes 
=8:19
ANSWER: 8:19 is the new time
Hope this helps!  :)