document.write( "Question 854598: The speed of a stream is 2 mph. A boat travels 9 miles upstream in the same time it takes to travel 13 miles downstream. what is the speed of the boat in still water \n" ); document.write( "
Algebra.Com's Answer #516480 by richwmiller(17219)\"\" \"About 
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r*t=d
\n" ); document.write( "(r-2)*t=9
\n" ); document.write( "(r-2*t=9
\n" ); document.write( "r*t-2*t=9\r
\n" ); document.write( "\n" ); document.write( "(r+2)*t=13
\n" ); document.write( "r*t+2*t=13
\n" ); document.write( "r*t-2*t=9
\n" ); document.write( "add
\n" ); document.write( "2r*t=22
\n" ); document.write( "r*t=22/2
\n" ); document.write( "r*t=11
\n" ); document.write( "ok
\n" ); document.write( "r*t-2*t=9
\n" ); document.write( "11-2*t=9
\n" ); document.write( "11-9=2*t
\n" ); document.write( "2=2*t
\n" ); document.write( "2/2=t
\n" ); document.write( "1=t
\n" ); document.write( "t=1 hour
\n" ); document.write( "r*1=11
\n" ); document.write( "r=11/1
\n" ); document.write( "r=11 mph
\n" ); document.write( "check
\n" ); document.write( "(r+c)*t=13
\n" ); document.write( "(11+2)*1=13
\n" ); document.write( "(13)*1=13
\n" ); document.write( "13=13\r
\n" ); document.write( "\n" ); document.write( "(r-c)*t=9
\n" ); document.write( "(11-c)*t=9
\n" ); document.write( "(11-2)*1=9
\n" ); document.write( "9*1=9
\n" ); document.write( "9=9
\n" ); document.write( "ok\r
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