document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=961328>Question 961328</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the current in a stream moves at a speed of 9 mph. A boat travels 22 mi upstream and 22 mi downstream in a total time of 5 hrs. what is 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 #587470 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=587470\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the current in a stream moves at a speed of 9 mph. A boat travels 22 mi upstream and 22 mi downstream in a total time of 5 hrs. what is the speed of the boat in still water<BR>\n" );
document.write( "***<BR>\n" );
document.write( "let x=speed of boat in still water<BR>\n" );
document.write( "x+9=speed of boat downstream<BR>\n" );
document.write( "x-9=speed of boat upstream<BR>\n" );
document.write( "..<BR>\n" );
document.write( "travel time=distance/speed<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=22%2F%28x%2B9%29%2B22%2F%28x-9%29=5 ALIGN=MIDDLE  ALT=\"22%2F%28x%2B9%29%2B22%2F%28x-9%29=5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "lcd: (x+9)(x-9)<BR>\n" );
document.write( "22/(x-9)+22/(x+9)=5(x+9)(x-9)<BR>\n" );
document.write( "22x+198+22x-198=5(x^2-81)<BR>\n" );
document.write( "44x=5x^2-405<BR>\n" );
document.write( "5x^2-44x-405=0<BR>\n" );
document.write( "solve for x by quadratic formula:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "a=5, b=-44, c=-405<BR>\n" );
document.write( "ans: x=14.4<BR>\n" );
document.write( "what is the speed of the boat in still water? 14.4 mph </SPAN>\n" );
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