Question: A stream flowing at 1 0 . 0 m 3 / s has a tributary feeding into it with a flowof 5 . 0 m

A stream flowing at 10.0 m3/s has a tributary feeding into it with a flowof 5.0 m3/s. The streams COD upstream of the junction is 20.0 mg/L,and COD of the tributary is 40.0 mg/L. Considering COD as aconservative parameter and assuming complete mixing of the twostreams, find the downstream COD of the river.

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