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A river is flowing at a flow rate of 12 cubic meters per second with a...

A river is flowing at a flow rate of 12 cubic meters per second with a background BOD of 2 milligrams per liter of Dissolved Oxygen. A large waste spill with a five day BOD of 230 mg/L is discharged into the river at a flow rate of 2 cubic meters per second. Assuming instantaneous mixing immediately at the point of discharge, find the ultimate BOD of the river water after mixing with the waste.

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