document.write( "Question 1066862: A motorbat can travel 9 miles/hr up a river and back downstream at 15 miles/hr. Find the rate of motorbat in still water and the rate of the river current. \n" ); document.write( "
Algebra.Com's Answer #682082 by josgarithmetic(39623)\"\" \"About 
You can put this solution on YOUR website!
Is the trip up the same distance as the trip back down?\r
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\n" ); document.write( "\n" ); document.write( "\"9%2Au=15%2Ab\" for uP and bACK times\r
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\n" ); document.write( "\n" ); document.write( "\"system%289=r-c%2C15=r%2Bc%29\" for r rate if no current, c for rate of just the current - this is the system needed.\r
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\n" ); document.write( "\n" ); document.write( "ELIMINATION METHOD\r
\n" ); document.write( "\n" ); document.write( "Add corresponding members.
\n" ); document.write( "\"%28r-c%29%2B%28r%2Bc%29=9%2B15\"
\n" ); document.write( "\"r-c%2Br%2Bc=24\"
\n" ); document.write( "\"2r=24\"
\n" ); document.write( "\"highlight%28r=12%29\"------boat speed in still water.
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\n" ); document.write( "Subtract corresponding members.
\n" ); document.write( "\"%28r%2Bc%29-%28r-c%29=15-9\"
\n" ); document.write( "\"2c=6\"
\n" ); document.write( "\"highlight%28c=3%29\"------speed of the river current
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