Answer:
64:25
Explanation:
It is given that the ratio of their edge lengths is 8:5.
Therefore,

where
and
are the length, breadth and height of the first prism and
and
are the length, breadth and height of the second prism.
So,

and

Now, surface area of a rectangular prism is :
A = 2(lb + bh + hl)
Therefore, ratio of the surface areas is:






Hence, the ratio of the surface areas of the rectangular prisms is 64:25.