document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=400516>Question 400516</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a boat traveled 45 miles downstream in 5 hours. the return trip took 9 hours upstream. what is the rate of the boat in still water in miles per hour? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #283526 by </B><A HREF=/tutors/aboutme.mpl?userid=Tatiana_Stebko><B>Tatiana_Stebko(1539)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Tatiana_Stebko><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=Tatiana_Stebko><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=283526\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let x(mph)= the rate of the boat in still water<BR>\n" );
document.write( "Let y mph = the rate of the river<BR>\n" );
document.write( "When boat travels downstream the rate is (x+y)mph<BR>\n" );
document.write( "From text:a boat traveled 45 miles downstream in 5 hours, so boat (downstream ) rate  was <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=45%2F5=9 ALIGN=MIDDLE  ALT=\"45%2F5=9\"   DISABLED_style= \"max-width:90%; height:auto;\" > mph<BR>\n" );
document.write( "We have the first equation of system<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%2By=9 ALIGN=MIDDLE  ALT=\"x%2By=9\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "When boat travels upstream the rate is (x-y) mph<BR>\n" );
document.write( "From text:a boat traveled 45 miles downstream in 9 hours, so boat (upstream ) rate  was <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=45%2F9=5 ALIGN=MIDDLE  ALT=\"45%2F9=5\"   DISABLED_style= \"max-width:90%; height:auto;\" > mph<BR>\n" );
document.write( "the second equation is<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x-y=5%29%29%29%0D%0ASolve+the+system%0D%0A%7B%7B%7Bx%2By=9 ALIGN=MIDDLE  ALT=\"x-y=5%29%29%29%0D%0ASolve+the+system%0D%0A%7B%7B%7Bx%2By=9\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x-y=5%29%29%29%0D%0AAdd+the+first+equation+to+the+second%0D%0A%7B%7B%7B2x=14 ALIGN=MIDDLE  ALT=\"x-y=5%29%29%29%0D%0AAdd+the+first+equation+to+the+second%0D%0A%7B%7B%7B2x=14\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=14%2F2 ALIGN=MIDDLE  ALT=\"x=14%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=7 ALIGN=MIDDLE  ALT=\"x=7\"   DISABLED_style= \"max-width:90%; height:auto;\" > mph - the rate of the boat in still water<BR>\n" );
document.write( "Answer 7 mph </SPAN>\n" );
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