A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is_____________________?
(A) 0.30 m/sec
(B) 0.35 m/sec
(C) 0.40 m/sec
(D) 0.45 m/sec
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