document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=816624>Question 816624</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A Mississippi riverboat can travel 70 kilometers downstream in 5 hours and can make the return trip in 7 hours. Find the speed of the boat in still water. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #491622 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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/cgi-bin/show-face.mpl?user=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=491622\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> boat speed = x<BR>\n" );
document.write( "current speed =y\r<BR>\n" );
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document.write( "upstream speed = x-y   ------- time 7 hours<BR>\n" );
document.write( "downstream speed = x+y---------time = 5 hours\r<BR>\n" );
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document.write( "distance = 70\r<BR>\n" );
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document.write( "t= d/r\r<BR>\n" );
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document.write( "70/(x-y)=7<BR>\n" );
document.write( "simplify<BR>\n" );
document.write( "x-y=10....................(1)\r<BR>\n" );
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document.write( "70/(x+y)=5\r<BR>\n" );
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document.write( "x+y=14.....................(2)\r<BR>\n" );
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document.write( "add (1) & (2)\r<BR>\n" );
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document.write( "2x=24<BR>\n" );
document.write( "x=12 mph speed of boat<BR>\n" );
document.write( " </SPAN>\n" );
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