  Consequences of the interference between spectator amplitudes for the
lifetimes and semileptonic decay fractions of B^0 and B^+ mesons are discussed.
Assuming duality and constructive interference between spectator amplitudes we
are able to explain the low experimental value for the semileptonic decay
fraction of $B$ mesons. Extracting these amplitudes from a fit to 11 exclusive
hadronic B decay fractions we find
  a_1 = 1.05 +/- 0.03 +/- 0.10,
  a_2 =+0.227 +/ 0.012 +/- 0.022,
  an inclusive semileptonic decay fraction of
  (11.2 +/- 0.5 +/- 1.7),
  and a lifetime ratio
  tau(B^+) / tau(B^0) = 0.83 +/- 0.01 +/- 0.01.
