explain pls

A large plastics manufacturer in Lake Charles, Louisiana, is constructing a 0.59-mile painted steel pipeline with an inside diameter of 250mm. Based on the industry's best practices, the pipeline is designed to transport liquid with a maximum depth of 70% of the inside diameter. Suppose the pipeline discharges into a cylindrical tank and decreases 2.0 feet in elevation for every 305m distance. What is the design volumetric flow rate of the pipeline if the pipeline coefficient is 0.013 ? Let 1 mile =5,280 feet and 1m=3.28 feet Answer: 2,937.6m3/ day