document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=862389>Question 862389</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A person rowed her boat upstream for a distance of 32 miles and then rowed backed to the starting point.  The total time of the trip was 18 hours.  If the rate of the current was 7 mph, find the average of the boat in still water.\r<BR>\n" );
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document.write( "My daughter and I are stuck on this problem, many thanks. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #519665 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=519665\">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=+t+ ALIGN=MIDDLE  ALT=\"+t+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the time in hours to row upstream<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+18+-+t+ ALIGN=MIDDLE  ALT=\"+18+-+t+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the time in hours to row downstream<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+ ALIGN=MIDDLE  ALT=\"+s+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the rate of the boat in still water in mi/hr<BR>\n" );
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document.write( "Rowing upstream:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+32+=+%28+s+-+7+%29%2At+ ALIGN=MIDDLE  ALT=\"+32+=+%28+s+-+7+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Rowing downstream:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+32+=+%28+s+%2B+7+%29%2A%28+18+-+t+%29+ ALIGN=MIDDLE  ALT=\"+32+=+%28+s+%2B+7+%29%2A%28+18+-+t+%29+\"   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+=+32+%2F+%28+s-7+%29+ ALIGN=MIDDLE  ALT=\"+t+=+32+%2F+%28+s-7+%29+\"   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=+32+=+18s+%2B+126+-+st+-+7t+ ALIGN=MIDDLE  ALT=\"+32+=+18s+%2B+126+-+st+-+7t+\"   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%2A%28+s+%2B+7+%29+-+18s+=+94+ ALIGN=MIDDLE  ALT=\"+t%2A%28+s+%2B+7+%29+-+18s+=+94+\"   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+=+%28+18s+-+94+%29+%2F+%28+s+%2B+7+%29+ ALIGN=MIDDLE  ALT=\"+t+=+%28+18s+-+94+%29+%2F+%28+s+%2B+7+%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=+32+%2F+%28+s+-+7+%29+=+%28+18s+-+94+%29+%2F+%28+s+%2B+7+%29+ ALIGN=MIDDLE  ALT=\"+32+%2F+%28+s+-+7+%29+=+%28+18s+-+94+%29+%2F+%28+s+%2B+7+%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=+32%2A%28+s+%2B+7+%29+=+%28+18s+-+94+%29%2A%28+s+-+7+%29+ ALIGN=MIDDLE  ALT=\"+32%2A%28+s+%2B+7+%29+=+%28+18s+-+94+%29%2A%28+s+-+7+%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=+32s+%2B+224+=+18s%5E2+-+94s+-+126s+%2B+658+ ALIGN=MIDDLE  ALT=\"+32s+%2B+224+=+18s%5E2+-+94s+-+126s+%2B+658+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+18s%5E2+-+252s+%2B+434+=+0+ ALIGN=MIDDLE  ALT=\"+18s%5E2+-+252s+%2B+434+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+9s%5E2+-+126s+%2B+217+=+0+ ALIGN=MIDDLE  ALT=\"+9s%5E2+-+126s+%2B+217+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Use the quadratic formula to solve, then<BR>\n" );
document.write( "find <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+ ALIGN=MIDDLE  ALT=\"+t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Check my math,I could have made an error<BR>\n" );
document.write( "The method should be OK\r<BR>\n" );
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