A mixture of titanium $(mathrm{SG}=4.5)$ and silica $(mathrm{SG}=2.65)$ particles, with diameters ranging from 50 to $300 mu

Question:

A mixture of titanium $(\mathrm{SG}=4.5)$ and silica $(\mathrm{SG}=2.65)$ particles, with diameters ranging from 50 to $300 \mu \mathrm{m}$, is dropped into a tank in which water is flowing upward. What is the velocity of the water if all of the silica particles are carried out with the water?

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