The drama club is showing a video f their recent play. the first showing began at 2: 30 p. m. the second showing was scheduled to start at 5: 25p. m. with a 1/2-hour break between the showings.

There are 2 videos played between 2:30pm to 5:25pm. with 1/2 hour break.
Let's find out how many hours is the span of time of a video.
First how many hour are there in 2:30 - 5:25
=> there are 2 and 55 minutes.
There's 1/2 hour break
=> 2 hours and 25 minutes
let's divide it by 2
=> 1 hour and 12.5 minutes each.

12+3b -1=-5-b -12-1+5=-b-3b -8=-4b