document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=110682>Question 110682</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In coloradoCreek, Darrell can row 24 km down stream in 6 hours or he can row 18 km upstream in the same amount of time. Find the rate he rows in still water and 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 #80638 by </B><A HREF=/tutors/aboutme.mpl?userid=Earlsdon><B>Earlsdon(6294)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Earlsdon><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=80638\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let R = Darrell's rowing speed in still waters and C = The current speed. <BR>\n" );
document.write( " <BR>\n" );
document.write( "From the the problem description, you can write:<BR>\n" );
document.write( "1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%5B1%5D+=+r%5B1%5Dt%5B1%5D ALIGN=MIDDLE  ALT=\"d%5B1%5D+=+r%5B1%5Dt%5B1%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > For the downstream trip.<BR>\n" );
document.write( "2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%5B2%5D+=+r%5B2%5Dt%5B2%5D ALIGN=MIDDLE  ALT=\"d%5B2%5D+=+r%5B2%5Dt%5B2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > For the upstream trip.\r<BR>\n" );
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document.write( "1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=24+=+r%5B1%5D%286%29 ALIGN=MIDDLE  ALT=\"24+=+r%5B1%5D%286%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5B1%5D+=+4 ALIGN=MIDDLE  ALT=\"r%5B1%5D+=+4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=18+=+r%5B2%5D%286%29 ALIGN=MIDDLE  ALT=\"18+=+r%5B2%5D%286%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5B2%5D+=+3 ALIGN=MIDDLE  ALT=\"r%5B2%5D+=+3\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "The downstream trip rate can be thought of as Darrells's rowing speed plus the current speed, or:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5B1%5D+=+R%2BC ALIGN=MIDDLE  ALT=\"r%5B1%5D+=+R%2BC\"   DISABLED_style= \"max-width:90%; height:auto;\" > or:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4+=+R%2BC ALIGN=MIDDLE  ALT=\"4+=+R%2BC\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The upstream trip rate can be thought of as Darrell's rowing speed minus the current speed, or:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5B2%5D+=+R-C ALIGN=MIDDLE  ALT=\"r%5B2%5D+=+R-C\"   DISABLED_style= \"max-width:90%; height:auto;\" > or:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3+=+R-C ALIGN=MIDDLE  ALT=\"3+=+R-C\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So you can add these two equations to find the value of R, Darrell's rowing speed in still water:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4+=+R%2BC ALIGN=MIDDLE  ALT=\"4+=+R%2BC\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3+=+R-C ALIGN=MIDDLE  ALT=\"3+=+R-C\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2R+=+7 ALIGN=MIDDLE  ALT=\"2R+=+7\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=R+=+3.5 ALIGN=MIDDLE  ALT=\"R+=+3.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Darrell's rowing speed in still water is 3.5 km/hr.<BR>\n" );
document.write( "The current speed is:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=C+=+R-3 ALIGN=MIDDLE  ALT=\"C+=+R-3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=C+=+3.5-3 ALIGN=MIDDLE  ALT=\"C+=+3.5-3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=C+=+0.5 ALIGN=MIDDLE  ALT=\"C+=+0.5\"   DISABLED_style= \"max-width:90%; height:auto;\" >km/hr<BR>\n" );
document.write( "  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );