document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=403213>Question 403213</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Here is another one I would need help with:<BR>\n" );
document.write( "Kevin was swimming agains the current, it took him 8 min. to swim 200 meters. Swimming back with the current took half as long. What is his average swimming speed and the speed of the current?<BR>\n" );
document.write( "Thank you for your help  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #285139 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=285139\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k ALIGN=MIDDLE  ALT=\"k\"   DISABLED_style= \"max-width:90%; height:auto;\" > = rate of swimming without current<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c ALIGN=MIDDLE  ALT=\"c\"   DISABLED_style= \"max-width:90%; height:auto;\" > = rate of current<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k+-+c ALIGN=MIDDLE  ALT=\"k+-+c\"   DISABLED_style= \"max-width:90%; height:auto;\" > = rate of swimming against current<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k+%2B+c ALIGN=MIDDLE  ALT=\"k+%2B+c\"   DISABLED_style= \"max-width:90%; height:auto;\" > = rate of swimming with current<BR>\n" );
document.write( "------------------<BR>\n" );
document.write( "given:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=200+=+%28k+-+c%29%2A8 ALIGN=MIDDLE  ALT=\"200+=+%28k+-+c%29%2A8\"   DISABLED_style= \"max-width:90%; height:auto;\" > meters<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=200+=+%28k+%2B+c%29%2A4 ALIGN=MIDDLE  ALT=\"200+=+%28k+%2B+c%29%2A4\"   DISABLED_style= \"max-width:90%; height:auto;\" > meters<BR>\n" );
document.write( "------------------<BR>\n" );
document.write( "This is 2 equations and 2 unknowns, so it's solvable<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8k+-+8c+=+200 ALIGN=MIDDLE  ALT=\"8k+-+8c+=+200\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4k+%2B+4c+=+200 ALIGN=MIDDLE  ALT=\"4k+%2B+4c+=+200\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply both sides of (2) by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2 ALIGN=MIDDLE  ALT=\"2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and add the equations<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8k+-+8c+=+200 ALIGN=MIDDLE  ALT=\"8k+-+8c+=+200\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8k+%2B+8c+=+400 ALIGN=MIDDLE  ALT=\"8k+%2B+8c+=+400\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=16k+=+600 ALIGN=MIDDLE  ALT=\"16k+=+600\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k+=+37.5 ALIGN=MIDDLE  ALT=\"k+=+37.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and, from (2),<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k+%2B+c+=+50 ALIGN=MIDDLE  ALT=\"k+%2B+c+=+50\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+c+=+12.5 ALIGN=MIDDLE  ALT=\"+c+=+12.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-----------------<BR>\n" );
document.write( "Always use the definition (ave. speed) = (total distance)/(total time)<BR>\n" );
document.write( "His ave. speed = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28200+%2B+200%29%2F%288+%2B+4%29+=+400%2F12 ALIGN=MIDDLE  ALT=\"%28200+%2B+200%29%2F%288+%2B+4%29+=+400%2F12\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=400%2F12+=+33.333 ALIGN=MIDDLE  ALT=\"400%2F12+=+33.333\"   DISABLED_style= \"max-width:90%; height:auto;\" > m/min<BR>\n" );
document.write( "The speed of the current is 12.5 m/min<BR>\n" );
document.write( " <BR>\n" );
document.write( "  </SPAN>\n" );
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