786. The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________? September 7, 2025 by Admin A. 30 minutes B. 1 hour C. 1 hour and 30 minutes D. 2 hours ✅ The correct answer is option D.