document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1204016>Question 1204016</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A motorboat takes 4 hours to travel 128 kilometers going upstream. The return trip takes 2 hours going downstream. What is the rate of the boat in still water and what is the rate of the current? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #839999 by </B><A HREF=/tutors/aboutme.mpl?userid=MathLover1><B>MathLover1(20850)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathLover1><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=MathLover1><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=839999\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let the rate of the boat in still water  be <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s ALIGN=MIDDLE  ALT=\"s\"   DISABLED_style= \"max-width:90%; height:auto;\" > and rate of the current be <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s%5B1%5D ALIGN=MIDDLE  ALT=\"s%5B1%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "Distance \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d=+128+mil ALIGN=MIDDLE  ALT=\"d=+128+mil\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Upstream rate = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+-+s%5B1%5D ALIGN=MIDDLE  ALT=\"s+-+s%5B1%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Downstream rate  = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+%2B+s%5B1%5D ALIGN=MIDDLE  ALT=\"s+%2B+s%5B1%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Time taken to travel upstream \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=128%2F%28s-s%5B1%5D%29+=+4 ALIGN=MIDDLE  ALT=\"128%2F%28s-s%5B1%5D%29+=+4\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=128%2F4=+s-s%5B1%5D+ ALIGN=MIDDLE  ALT=\"128%2F4=+s-s%5B1%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+-+s%5B1%5D+=+32 ALIGN=MIDDLE  ALT=\"s+-+s%5B1%5D+=+32\"   DISABLED_style= \"max-width:90%; height:auto;\" > ..........eq.1\r<BR>\n" );
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document.write( "Time taken to travel downstream \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=128%2F%28s%2Bs%5B1%5D%29+=+2 ALIGN=MIDDLE  ALT=\"128%2F%28s%2Bs%5B1%5D%29+=+2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=128%2F2=+s%2Bs%5B1%5D+ ALIGN=MIDDLE  ALT=\"128%2F2=+s%2Bs%5B1%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( " <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+%2B+s%5B1%5D+=+64 ALIGN=MIDDLE  ALT=\"s+%2B+s%5B1%5D+=+64\"   DISABLED_style= \"max-width:90%; height:auto;\" > ..........eq.2\r<BR>\n" );
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document.write( "add eq.1 and  eq.2\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+-+s%5B1%5D+%2B+s+%2B+s%5B1%5D+=+32+%2B+64++++ ALIGN=MIDDLE  ALT=\"s+-+s%5B1%5D+%2B+s+%2B+s%5B1%5D+=+32+%2B+64++++\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2s+=+96 ALIGN=MIDDLE  ALT=\"2s+=+96\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( " <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=+48mph ALIGN=MIDDLE  ALT=\"s+=+48mph\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Substituting in eq.2\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=48+%2B+s%5B1%5D+=+64 ALIGN=MIDDLE  ALT=\"48+%2B+s%5B1%5D+=+64\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s%5B1%5D+=+16mph++ ALIGN=MIDDLE  ALT=\"s%5B1%5D+=+16mph++\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "answer:\r<BR>\n" );
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document.write( "Rate of the boat in still water  is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=48%28mil%2Fh%29 ALIGN=MIDDLE  ALT=\"48%28mil%2Fh%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Rate of the current is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=16%28mil%2Fh+%29 ALIGN=MIDDLE  ALT=\"16%28mil%2Fh+%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >       \r<BR>\n" );
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document.write( " </SPAN>\n" );
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