  We extend the approach based on the light-cone expansion and the heavy quark
effective theory to the inclusive semileptonic decay of an unpolarized
$b$-flavored hadron. It is applied to calculate the semileptonic decay width of
the $\Lambda_b$ baryon and its ratio to that of the B meson. We obtain
$\Gamma_{SL}(\Lambda_b)= 51\pm 9 |V_{cb}|^2{ps}^{-1}$ and
$\Gamma_{SL}(\Lambda_b)/\Gamma_{SL}(B)= 1.052\pm 0.006$. From the latter, the
semileptonic branching fraction for $\Lambda_b$ is predicted to be $(8.7\pm
0.7)%$.
