(Solved): 2) A 12-inch diameter, 2,000-foot long water main carries 10cfs and branches into parallel 6-inch a ...

2) A 12-inch diameter, 2,000-foot long water main carries $10\mathrm{cfs}$ and branches into parallel 6-inch and 8-inch water mains. Each water main branch is 500 feet long. If all pipelines are horizontal and coefficients of friction are 0.004 , the flow rate (in cfs) in the 6-inch water main is most nearly