document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1046114>Question 1046114</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Heather's boat has a top speed of <BR>\n" );
document.write( "6<BR>\n" );
document.write( " miles per hour in still water. While traveling on a river at top speed, she went <BR>\n" );
document.write( "10<BR>\n" );
document.write( " miles upstream in the same amount of time she went <BR>\n" );
document.write( "30<BR>\n" );
document.write( " miles downstream. Find the rate of the river current. <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #661623 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=661623\">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=+c+ ALIGN=MIDDLE  ALT=\"+c+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the speed of the curent in mi/hr<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+6+-+c+ ALIGN=MIDDLE  ALT=\"+6+-+c+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = her speed going upstream<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+6+%2B+c+ ALIGN=MIDDLE  ALT=\"+6+%2B+c+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = her speed going downstream<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+ ALIGN=MIDDLE  ALT=\"+t+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = her time in hrs for both trips<BR>\n" );
document.write( "---------------------------------------<BR>\n" );
document.write( "Going upstream:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+10+=+%28+6-c+%29%2At+ ALIGN=MIDDLE  ALT=\"+10+=+%28+6-c+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Going downstream:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+30+=+%28+6%2Bc+%29%2At+ ALIGN=MIDDLE  ALT=\"+30+=+%28+6%2Bc+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "---------------------<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+10%2F%28+6-c+%29+ ALIGN=MIDDLE  ALT=\"+t+=+10%2F%28+6-c+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Plug (1) into (2)<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+30+=+%28+6%2Bc+%29%2A%28+10+%2F+%28+6+-+c+%29+%29+ ALIGN=MIDDLE  ALT=\"+30+=+%28+6%2Bc+%29%2A%28+10+%2F+%28+6+-+c+%29+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+30%2A%28+6-c+%29+=+10%2A%28+6+%2B+c+%29+ ALIGN=MIDDLE  ALT=\"+30%2A%28+6-c+%29+=+10%2A%28+6+%2B+c+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+180+-+30c+=+60+%2B+10c+ ALIGN=MIDDLE  ALT=\"+180+-+30c+=+60+%2B+10c+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+40c+=+120+ ALIGN=MIDDLE  ALT=\"+40c+=+120+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+c+=+3+ ALIGN=MIDDLE  ALT=\"+c+=+3+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The rate of the current is 3 mi/hr<BR>\n" );
document.write( "----------------------------------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+10+=+%28+6-c+%29%2At+ ALIGN=MIDDLE  ALT=\"+10+=+%28+6-c+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+10+=+%28+6-3+%29%2At+ ALIGN=MIDDLE  ALT=\"+10+=+%28+6-3+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+10+=+3t+ ALIGN=MIDDLE  ALT=\"+10+=+3t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+10%2F3+ ALIGN=MIDDLE  ALT=\"+t+=+10%2F3+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+30+=+%28+6%2Bc+%29%2At+ ALIGN=MIDDLE  ALT=\"+30+=+%28+6%2Bc+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+30+=+%28+6%2B3+%29%2At+ ALIGN=MIDDLE  ALT=\"+30+=+%28+6%2B3+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+30+=+9t+ ALIGN=MIDDLE  ALT=\"+30+=+9t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+10%2F3+ ALIGN=MIDDLE  ALT=\"+t+=+10%2F3+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );