document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1185907>Question 1185907</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boat travels 20 km/h in still water. If this boat goes upstream in a river flowing at a rate of 6 km/h for 10 km, and then returns back downstream to its starting point, what is the average speed for the whole trip in km/h? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #816762 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39618)</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=816762\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Upstream<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10%2F%2820-6%29 ALIGN=MIDDLE  ALT=\"10%2F%2820-6%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10%2F14 ALIGN=MIDDLE  ALT=\"10%2F14\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5%2F7 ALIGN=MIDDLE  ALT=\"5%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" ><IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=hours ALIGN=MIDDLE  ALT=\"hours\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Downstream<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10%2F26 ALIGN=MIDDLE  ALT=\"10%2F26\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5%2F13 ALIGN=MIDDLE  ALT=\"5%2F13\"   DISABLED_style= \"max-width:90%; height:auto;\" ><IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=hours ALIGN=MIDDLE  ALT=\"hours\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Average speed of whole round-trip:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2810%2B10%29%2F%285%2F7%2B5%2F13%29 ALIGN=MIDDLE  ALT=\"%2810%2B10%29%2F%285%2F7%2B5%2F13%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=kilometers ALIGN=MIDDLE  ALT=\"kilometers\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Simplify and compute.\r<BR>\n" );
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document.write( "<PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">\r\n" );
document.write( "              SPEEDS         TIMES               DISTANCES\r\n" );
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document.write( "upstream        20-6         10/(20-6)                10\r\n" );
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document.write( "downstream      20+6         10/(20+6)                10\r\n" );
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document.write( "TOTALS                     10/(20-6)+10/(20+6)       2*10\r\n" );
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document.write( "Average Speed, round-trip\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282%2A10%29%2F%2810%2F%2820-6%29%2B10%2F%2820%2B6%29%29 ALIGN=MIDDLE  ALT=\"%282%2A10%29%2F%2810%2F%2820-6%29%2B10%2F%2820%2B6%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2810%2F10%29%282%2F%281%2F%2820-6%29%2B1%2F%2820%2B6%29%29%29 ALIGN=MIDDLE  ALT=\"%2810%2F10%29%282%2F%281%2F%2820-6%29%2B1%2F%2820%2B6%29%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%282%2F%281%2F%2820-6%29%2B1%2F%2820%2B6%29%29%29 ALIGN=MIDDLE  ALT=\"highlight_green%282%2F%281%2F%2820-6%29%2B1%2F%2820%2B6%29%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >---------------compute the value. </SPAN>\n" );
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