Problem 4. Ivan started watching a movie at 20 hours and 20 minutes. During the movie, there were two breaks for advertisements. The first break lasted 3 minutes and the second break lasted 4 minutes. The movie ended at 22 hours and 37 minutes. How long would the movie have lasted without advertisements?
Solution. From 22 hours and 37 minutes, we subtract 20 hours and 20 minutes, which gives us 2 hours and 17 minutes. Then from them, we will subtract $3+4=7$ minutes for the advertisement break, so we get that the movie lasts 2 hours and 10 minutes.