document.write( "Question 968623: Julie and Eric row their boat( at a constant speed) 63 miles downstream for 7 hours, helped by the current. Rowing at the same rate, the trip back against the current takes 9 hours. Find the rate of the current. \n" ); document.write( "
Algebra.Com's Answer #591875 by lwsshak3(11628)\"\" \"About 
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Julie and Eric row their boat( at a constant speed) 63 miles downstream for 7 hours, helped by the current. Rowing at the same rate, the trip back against the current takes 9 hours. Find the rate of the current.
\n" ); document.write( "***
\n" ); document.write( "let x=rowboat speed in still water(current=0)
\n" ); document.write( "let c=speed of current
\n" ); document.write( "x+c=rowboat speed with current
\n" ); document.write( "x-c=rowboat speed against current
\n" ); document.write( "travel time*speed =distance
\n" ); document.write( "..
\n" ); document.write( "7(x+c)=63
\n" ); document.write( "9(x-c)=63
\n" ); document.write( "..
\n" ); document.write( "7x+7c=63
\n" ); document.write( "9x-9c=63
\n" ); document.write( "..
\n" ); document.write( "63x+63c=567 (mult. eq by 9)
\n" ); document.write( "63x-63c=441 (mult. eq by 7)
\n" ); document.write( "subtract:
\n" ); document.write( "126c=126
\n" ); document.write( "c=1
\n" ); document.write( "rate of the current=1 mph \n" ); document.write( "
\n" );