Is 35 feet for every seven seconds equivalent to 7 feet for every second

No,
For unit rates of travel, divide distance by time. 35/7 = 5 ft/s, which ≠ 7 ft/s.

No, 35/7= 5 making the first rate equivalent to 5 feet every second

Alright mate, lets do some math!
We are trying to find the height of each hay bale right? So we need to divide the volume by the length and the width... so:
H = (10 2/3ft^3) diveded by (1 1/3ft x 4ft)
H = 2 ft
There are 8 bales of hay mate, so we have to multipy that by the H... so 2x8= 16ft.
Hope this helped!