document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=772699>Question 772699</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A river flows at 2 m/s. What is the speed through the water of the boat that can go twice as fast downstream as upstream? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #471842 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39620)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=471842\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A data table is not necessary and would be adding more details than we can use.\r<BR>\n" );
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document.write( "r = speed of boat if in still water<BR>\n" );
document.write( "2 m/s = the given speed of the river's current\r<BR>\n" );
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document.write( "r+2 = downstream speed for boat in river<BR>\n" );
document.write( "r-2 = upstream speed for boat in river\r<BR>\n" );
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document.write( "\"twice as fast downstream as upstream\":<BR>\n" );
document.write( "Means that downstream speed is 2 times the upstream speed.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28r%2B2=2%28r-2%29%29 ALIGN=MIDDLE  ALT=\"highlight%28r%2B2=2%28r-2%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Algebra steps:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%2B2=2r-4 ALIGN=MIDDLE  ALT=\"r%2B2=2r-4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0%2B2=2r-r-4 ALIGN=MIDDLE  ALT=\"0%2B2=2r-r-4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2=r-4 ALIGN=MIDDLE  ALT=\"2=r-4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r-4=2 ALIGN=MIDDLE  ALT=\"r-4=2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r-4%2B4=2%2B4 ALIGN=MIDDLE  ALT=\"r-4%2B4=2%2B4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28r=6%29 ALIGN=MIDDLE  ALT=\"highlight%28r=6%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%2Fs ALIGN=MIDDLE  ALT=\"m%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" >, the boat in non-moving water.\r<BR>\n" );
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document.write( "Actually, the \"speed through the water of the boat\" in the two directions are these:<BR>\n" );
document.write( "UPSTREAM, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%2B2=6%2B2=highlight%288%29 ALIGN=MIDDLE  ALT=\"r%2B2=6%2B2=highlight%288%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%2Fs ALIGN=MIDDLE  ALT=\"m%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "DOWNSTREAM, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r-2=6-2=highlight%284%29 ALIGN=MIDDLE  ALT=\"r-2=6-2=highlight%284%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%2Fs ALIGN=MIDDLE  ALT=\"m%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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