1974. If it rains between 2 P.M. and 3 P.M. and the entire basin area just starts contributing water at 3 P.M. to the outlet, then time of concentration will be_____________________? September 7, 2025 by Admin A. 15 minutes B. 20 minutes C. 30 minutes D. 60 minutes ✅ The correct answer is option D.
