document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=763340>Question 763340</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Alvin can go upstream at a rate of 20 miles per hour and downstream at a rate of 30 miles per hour. One day while Alvin was on the river, he received a call telling him he needs to turn around and come home. So he turned around and went back to his starting point. If his entire trip took 10 hours, how far did he travel on the river? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #464702 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=464702\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Alvin can go upstream at a rate of 20 miles per hour and downstream at a rate of 30 miles per hour. One day while Alvin was on the river, he received a call telling him he needs to turn around and come home. So he turned around and went back to his starting point. If his entire trip took 10 hours, how far did he travel on the river?<BR>\n" );
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document.write( "let x=travel time upstream<BR>\n" );
document.write( "10-x=travel time downstream<BR>\n" );
document.write( "distance=speed*travel time (same for both directions)<BR>\n" );
document.write( "..<BR>\n" );
document.write( "20x=30(10-x)<BR>\n" );
document.write( "20x=300-30x<BR>\n" );
document.write( "50x=300<BR>\n" );
document.write( "x=6<BR>\n" );
document.write( "distance=20x=120<BR>\n" );
document.write( "how far did he travel on the river? 120 miles </SPAN>\n" );
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