You did not provide a photo, so there is nothing to answer.
Answer: 6 hours : 1 book
A unit rate is a rate expressed as a quantity of 1
1/3x + 5 = -2 is the way to set up the equation…. You got this!
Let the price in storeB=x
5/6x=150.6
x=180.72
180.72-150.6=$30.12
you save $30.12