Hey there!!
We know that the time to play each song is the same.
We play 8 songs.
Hence,
song+song+song+song+song+song+song+song = 28
... 8×song = 28
Dividing by 8 on both sides:
... song = 28÷8
... song = 3.5
Hence, the time taken to play each song is 3.5 minutes.
Hope my answer helps!