In order to solve this, we just need to know what time the movie began and how long it lasted. We know that the movie started at 2:35 and lasted 1 hour and 45 minutes. We can split the time that it lasted into the hour and the 45 minutes to make things easier, since 1 hour after 2:35 is simply 3:35.
From here, we can add the extra 45 minutes. We can do this by first finding out how many minutes were left in that hour. There are 60 minutes in 1 hour, and 60 - 35 = 25 minutes
45 - 25 = 20
So after adding the 25 minutes to complete the hour (4:00), we have 20 minutes left, which we can add to the new time to find out the final time that the movie ended.
4:00 + 0:20 = 4:20
The movie that Darnell and his friends went to see ended at 4:20. Hope that helped! =)