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We extend the standard model by adding an extra generation of isosinglet up-and down-type quark pair which engage in weak interactions only via mixing withthe three ordinary quark families. It is shown that the generalized $4\times 4$quark mixing matrix, which is necessarily nonunitary, leads to nonvanishingflavor changing neutral currents. We then proceed to investigate variousdistributions and total branching ratio of the inclusive B -> X_s l+ l- (l=e,\mu) rare B decays in the context of this model. It is shown that the shapesof the differential branching ratio and forward-backward asymmetry distributionare very sensitive to the value of the model parameters which are constrainedby the experimental upper bound on BR(B -> X_s \mu^+ \mu^-). We also indicatethat, for certain values of the dileptonic invariant mass, CP asymmetries up to10% can be obtained.Comment: 10 pages, 5 figures, Talk given at 23rd Annual MRST  (Montreal-Rochester-Syracuse-Toronto) Conference on High Energy Physics (MRST  2001), London, Ontario, Canada, 16-18 May 200

B→X[sub s]l[sup +]l[sup −] in the vectorlike quark model