Question

What is the unit rate of 1/5 and 1/4

Answer 1

You don't say what you are measuring.
Generally, questions like this do include that info.

Example:  What is the unit rate of (1/5) white per (1/4 yellow)?

To determine this, divide (1/5) white)     by     (1/4 yellow)

1 white
 -----------
       5
------------------ = 0.20/0.25 white per yellow, or 0.8 white per yellow.
1 yellow
-----------
       4