document.write( "Question 272376: a motor boat can travel 15 miles per hour downstream and 9 miles upstream per hour on a certin river. Fint the rate of the current and the rate at which the boat can travel on still water. \n" ); document.write( "
Algebra.Com's Answer #199266 by scott8148(6628)\"\" \"About 
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b + c = 15\r
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\n" ); document.write( "\n" ); document.write( "b - c = 9\r
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\n" ); document.write( "\n" ); document.write( "adding equations ___ 2b = 24 ___ b = 12\r
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\n" ); document.write( "\n" ); document.write( "substituting ___ 12 + c = 15 ___ c = 3
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