SOLUTION: The current in a stream moves at a speed of 4mi/h. A boat travels 4 mi upstream and 12 mi downstream in a total time of 2 hours. What is the speed of the boat in still water?
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Question 442909: The current in a stream moves at a speed of 4mi/h. A boat travels 4 mi upstream and 12 mi downstream in a total time of 2 hours. What is the speed of the boat in still water?
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
4/x-4+12/x+4=2
4(x+4)+12(x-4)=2x2-32
4x+16+12x-48=2x2-32
0=2x2-16x
x2=8x
x=8
The speed of the boat in still water is 8mph..
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