document.write( "Question 1005354: a boat travels 1 km upstream and 1 km back. The time for the round trip is 5 hrs. the speed of the stream is 4 km/hr. what is the speed of the boat in still water? \n" ); document.write( "
Algebra.Com's Answer #621691 by MathTherapy(10555)\"\" \"About 
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a boat travels 1 km upstream and 1 km back. The time for the round trip is 5 hrs. the speed of the stream is 4 km/hr. what is the speed of the boat in still water?
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With S being speed of boat in still water, time equation formed is: \"1%2F%28S+-+4%29+%2B+1%2F%28S+%2B+4%29+=+5\", resulting in the quadratic equation: \"5S%5E2+-+2S+-+80+=+0\"
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document.write( "This CANNOT be factored, so use the quadratic equation formula, or completing the square to solve for S
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document.write( "Solve for S to get a positive (> 0) solution, or speed of: \"highlight_green%284.204996879%09%09%09%09%0D%0A%29\" km/h in still water \n" );
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