document.write( "Question 402051: The river is moving at 5 miles per hour. A boat can travel 5 miles upstream in the same time that it takes to travel 15 miles downstream. How fast can the boat go in still water?
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Algebra.Com's Answer #284492 by robertb(5830)\"\" \"About 
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\"5%2F%28r+-+5%29+=+15%2F%28r%2B5%29\"
\n" ); document.write( "==> \"1%2F%28r+-+5%29+=+3%2F%28r%2B5%29\"
\n" ); document.write( "==> r + 5 = 3(r-5)
\n" ); document.write( "==> r + 5 = 3r - 15
\n" ); document.write( "==> 20 = 2r
\n" ); document.write( "==> r = 10 mph, the speed of the boat in still water.
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