To supply water in an amount of Q = 2, m3 / min to a di

To supply water in an amount of Q = 2, m3 / min to a distance L = 400 m under a pressure of H = 9 m, cast-iron pipes with diameters d1 = 150 mm and d2 = 200 mm can be used. Determine the required lengths of pipeline sections, taking the pipe roughness э = 1.2 mm.
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