If both X and Y , distributed independently, follow
Chapter 8, Problem 7.23(choose chapter or problem)
If both X and Y , distributed independently, follow exponential distributions with mean parameter 1, nd the distributions of (a) U = X + Y ; (b) V = X/(X + Y ).
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer