A business wishes to discharge salt into a river. the concentration of salt from the business is 210 mg/L. the flow of water in the river (upstream) is 0.5 m^3/s. Upstram the concentration of salt in the river 15 mg/L. what is the maximum flowrate in (m^3/s) the business can discharge the salt if the concentation of salt in the river (after mixing) cannot exceed 75 mg/L. Include a diagram depiciting the problem. The system is complete mix. Assume that the mixed flowrate is same