5.4
  1.057 bytes/s = 8.456 bits/s


5.8

P1:                     P2:
send (M1, P2)           recv (P1)
send (M2, P2)           recv (P1)


5.9

Using a token passed two times over a virtual cycle formed by
all processes (1 - 2 - 3...N, N - 1, 1 ... N) = 2*N - 1 messages