We obtain a numerical solution for the synchronous motion of two spheres
moving in viscous fluid. We find that for a given amount of work performed, the
final distance travelled by each sphere is increased by the presence of the
other sphere. The result suggests that the transport efficiency of molecular
motor cargo in vivo may be improved due to an effective hydrodynamic
interaction with neighboring cargos moving along the same direction.Comment: 12 pages, 10 figures, minor correction
