A river 160 m wide and 50 m deep drains a 30000 km2 land, Ask an Expert

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A river 16.0 m wide and 5.0 m deep drains a 3000.0 km2 land area in which the average precipitation is 48 cm/year. One-eighth of this rainfall returns to the atmosphere by evaporation, but the remainder ultimately drains into the river. What is the average speed of the river?

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