Question: PLEASE DON'T COPY THE ANSWER FROM THE OTHER SOURCE. 12. A laboratory test on a suspension of a solid in a liquid gave the following

PLEASE DON'T COPY THE ANSWER FROM THE OTHER SOURCE.

PLEASE DON'T COPY THE ANSWER FROM THE OTHER SOURCE. 12. A laboratory

12. A laboratory test on a suspension of a solid in a liquid gave the following information: Original height of sludge before settling 10 in. Free settling rate 0.10 in./min Height of sludge at the end of free-settling period 6.5 in. Height of the sludge at the end of 120 minutes 4 in. Height of sludge when settled completely 1.5 in. One thousand cubic feet of similar sludge is to be settled in a vertical cylindrical tank, the diameter of which is equal to the depth of the liquid suspension in it. The time it would take for the solid to settle to a height of 20% of the original height of the sludge is a. 78.5 hours c. 68.5 hours b. 65 hours d. 85.8 hours

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