Nathan is out rafting. he rafts 16 miles with the river current. at the end of 16 miles, he turns around and rafts the same distance against the river current. the journey takes him 4 hours overall. if he can raft at a speed of 9 mph in still water, what is the speed of the current of the river he is in?

Speed of the current of the river = 3 mph

Step-by-step explanation:

Let the speed of the current of the river he is in be u mph.

He rafts 16 miles with the river current. At the end of 16 miles, he turns around and rafts the same distance against the river current. The journey takes him 4 hours overall.He can raft at a speed of 9 mph in still water

That is

Speed of the current of the river = 3 mph

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not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this