The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is
A. 204 cu.m
B. 208 cu.m
C. 212 cu.m
D. 216 cu.m
Answer: Option D
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Detention time = V/Q.
Give data, Dt=2 hrs
Volume= 24*6*3,
Q=V/Dt, =24*6*3/2=216