During the spring snow melt: a storm sewer system

During the spring snow melt: a storm sewer system (C m^3/sec) discharges salts into a river at a concentration of D mg/L. Upstream from the sewer discharge point, the river concentration in salts is A ppm and the river flow is B m^3/sec. The salts quickly become uniformly distributed in the river. A large city not too far downstream from the discharge point use the river as a source of drinking water and blends the water with enough water from another river not containing the salts, such that the water delivered to the customers contains a maximum of E ppm of salts. What should be the blending ratio of salt-free water to river water? A = 416.7, B = 17.4, C = 6.42; D = 1, 389.6, E = 436.5. Show transcribed image text