document.write( "Question 1191070: Lauren's boat can go 9 miles per hour in still water. How far downstream can Lauren go if the river has a current of 3 miles per hour and she must be back in 4 hours. \n" ); document.write( "

Algebra.Com's Answer #822818 by josgarithmetic(39625) $\"\"$ $\"About$

You can put this solution on YOUR website!

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document.write( "                   SPEEDS      TIMES       DISTANCES\r\n" );
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document.write( "downstream         9+3=12       x            12x\r\n" );
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document.write( "upstream           9-3=6        4-x           6(4-x)\r\n" );
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document.write( "TOTAL                             4\r\n" );
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\n" ); document.write( "The distances both directions are equal.\r
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\n" ); document.write( "\n" ); document.write( " $\"12x=6%284-x%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"2x=4-x\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"3x=4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"cross%28x=3%2F4%29\"$
\n" ); document.write( " $\"x=4%2F3\"$ \r
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\n" ); document.write( "\n" ); document.write( "She can go $\"cross%2812%283%2F4%29=highlight%289%29%29\"$ $\"12%284%2F3%29=4%2A4=highlight%2816%29\"$ miles down the river.\r
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