Geoffrey's parents went to a comedy show that started at 8:30 P. M. and lasted 2 hours and 45 minutes. What time did the show end?

8:30 pm + 2 hours = 10:30 pm, now add 45 min. 30 + 45 = 75 min. since there is only 60 minutes in an hour you subtract 60 from 75 (15) and add another hour to 10:30 pm making it 11:30 pm. Now you have 15 mins left and you add that to 11:30 pm making it 11:45 pm.

The show ended at 11:45 pm