SOLUTION: A man can row at 6km/h in still water. He rows 8km up a river and then back again, taking 3 hours for the total trip. If the current of the stream is flowing at (x)km/h: 1) Write

Question 450118: A man can row at 6km/h in still water. He rows 8km up a river and then back again, taking 3 hours for the total trip. If the current of the stream is flowing at (x)km/h:
1) Write down an expression for the speed at which he rows upstream.
2) Write down an expression for the speed at which he rows downstream.
3) Calculate the speed at which the river was flowing.
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
8/(6+x)+8/(6-x)=3
8(6-x)+8(6+x)=3(36-x2)
48-8x+48+8x=108-x2
108-96=x2
x2=12
x=√12=2√3
The river was flowing at 2√3 kph..

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