If weight of all solids in the reactor is 300kg and the feed rate of solids is \(\frac{50kg}{hr},\) then the mean residence time(in hrs) of a material of a given size for mixed flow of a mixture of sizes of unchanging size particles is ____

(a) 7

(b) 6

(c) 4

(d) 3

I had been asked this question during an interview.

The query is from Design of Fluid Particle Reactors topic in division Fluid-Particle Reactions: Kinetics of Chemical Reaction Engineering

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