document.write( "Question 442300: A boat traveled 210 miles downstream and back. The trip downstream took 10 hours. The trip back
\n" ); document.write( "took 70 hours. What is the speed of the boat in still water? What is the speed of the current?
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Algebra.Com's Answer #853302 by timofer(138)\"\" \"About 
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x, speed of boat in still water
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\n" ); document.write( "\n" ); document.write( "\"%28x%2By%29%2810%29=210\" and \"%28x-y%29%2870%29=210\"\r
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\n" ); document.write( "\n" ); document.write( "\"x%2By=21\" and \"x-y=3\"\r
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\n" ); document.write( "\n" ); document.write( "\"2x=24\"
\n" ); document.write( "\"x=12\" boat in still water\r
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\n" ); document.write( "\n" ); document.write( "\"2y=18\"
\n" ); document.write( "\"y=9\" river current speed
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