document.write( "Question 36973: I am a home schooled student and i do not have a text book curriculum.
\n" ); document.write( "The excursion boat on a river takes 2 1/2 hours to make the trip to a point 12 miles upstream and to return. If the rate at whick the boat travels in still water is 5 times the rate of the river current, what is the rate of the current?
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Algebra.Com's Answer #22749 by Paul(988)\"\" \"About 
You can put this solution on YOUR website!
Leeting x be the rate fo the current:
\n" ); document.write( " 2 1/2 hours ->2.5 hours
\n" ); document.write( "Equation:
\n" ); document.write( "\"12%2F%285x%2Bx%29%2B12%2F%285x-x%29=2.5\"
\n" ); document.write( "12[(6x)+(4x)]=2.5[(6x)(4x)]
\n" ); document.write( "\"12%2810x%29=2.5%2824x%5E2%29\"
\n" ); document.write( "\"120x=60x%5E2\"\r
\n" ); document.write( "\n" ); document.write( "\"x%5E2-2x=0\"
\n" ); document.write( "x(x-2) or...
\n" ); document.write( "\"d0%2Fdt=2x%28dx%2Fdt%29-2%28dx%2Fdt%29\"
\n" ); document.write( "x=1
\n" ); document.write( "Multiply the result by 2
\n" ); document.write( "x=2
\n" ); document.write( "Hence, the rate of the current is 2mph.
\n" ); document.write( "Paul.
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