document.write( "Question 632805: A cruise boat travels 72 miles downstream in 4 hours and returns upstream in 6 hours. Find the rate of the stream \n" ); document.write( "
Algebra.Com's Answer #398490 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
r*t=d
\n" ); document.write( "(r+c)*4=72;
\n" ); document.write( "(r-c)*6=72
\n" ); document.write( "c=3 r=15
\n" ); document.write( "
\n" );