document.write( "Question 58639This question is from textbook
\n" ); document.write( ": Rita rows 12 km upstream and 12 km downstream in 3 hours. The speed of her boat in still water is 9 km/hr. Find the speed of the stream.\r
\n" ); document.write( "\n" ); document.write( "I am thinking that I need to use the formula Time = distance/rate? \n" ); document.write( "
Algebra.Com's Answer #40175 by checkley71(8403)\"\" \"About 
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d=rt or
\n" ); document.write( "d/r=t\r
\n" ); document.write( "\n" ); document.write( "12/(9+x)+12/(9-x)=3
\n" ); document.write( "[12(9-x)+12(9+x)]/(9+x)(9-x)=3
\n" ); document.write( "(108-12x+108+12x)/(81-x^2)=3
\n" ); document.write( "216/(81-x^2)=3
\n" ); document.write( "(81-x^2)3=216
\n" ); document.write( "243-3x^2=216
\n" ); document.write( "-3x2=216-243
\n" ); document.write( "-3x^2=-27
\n" ); document.write( "x^2=-27/-3
\n" ); document.write( "x^2=9
\n" ); document.write( "x=sqrt9
\n" ); document.write( "x=3 km/hr for the current
\n" ); document.write( "proof
\n" ); document.write( "12/(9+3)+12/(9-3)=3
\n" ); document.write( "12/12+12/6=3
\n" ); document.write( "1+2=3
\n" ); document.write( "3=3\r
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