Liquid benzene and liquid n-hexane are blended to form a stream flowing at a rate of 1000 lbm/h. An on-line densimeter (an instrument used to determine density) indicates that the stream has a density of 0.850 g/ml. Using specific gravities from Table B.1, estimate the mass and volumetric feed flow rates of the two hydrocarbons to the mixing vessel (in American engineering units).