  A nonreflecting wavepacket is constructed by the superposition of
reflectionless eigenstates of sech2 potential. Free propagation and propagation
in the presence of the above potential of such a wavepacket is considered using
the concept of arrival time. Comparison is made with the free evolving Gaussian
wavepacket. Mean arrival time at a detector behind the well is given as a
function of mass for separate cases. A selection of Bohmian trajectories in the
interacting case are computed and compared to the trajectories of a free
particle guided by a Gaussian packet.
