Answer:
Each single entertainment segment is 4.5 minutes.
Explanation:
Out of the 20 minute show there are two blocks of time that are ads. The ads are each 13/4 minutes long.
13/4 = 13 ÷ 4 = 3.25
minutes.
Let's take away the time used for ads from the 20 minite total.
20 - 3.25 - 3.25
= 13.5
Without ads the show's actual runtime is 13.5 minutes.
Now we'll divide that 13.5 into three equal parts.
13.5 ÷ 3 = 4.5
Each of the three equal entertainment segments is 4.5 minutes long.