document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1157671>Question 1157671</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Janet and Michael took a canoeing trip, traveling 6 miles upstream along a river, against a 2 mi/h current. They then returned downstream to the starting point of their trip. If their entire trip took 4 hours, what was their rate in still water? </SPAN>\n" );
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document.write( "traveling 6 miles upstream along a river, against a 2 mi/h current. They then returned downstream to the starting point of their trip. If their entire trip took 4 hours, what was their rate in still water?<BR>\n" );
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document.write( "Description did not involve any traveling done in still water; only in MOVING water, with and against the current.\r<BR>\n" );
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document.write( "Upstream, if r is speed of canoe in absence of current<BR>\n" );
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document.write( "Solve for r, the speed of canoe in still water.\r<BR>\n" );
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document.write( "Simplification gives  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2-3r-4=0 ALIGN=MIDDLE  ALT=\"r%5E2-3r-4=0\"   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%28r=4%29 ALIGN=MIDDLE  ALT=\"highlight%28r=4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "check:<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=6%2F2%2B6%2F6 ALIGN=MIDDLE  ALT=\"6%2F2%2B6%2F6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3%2B1 ALIGN=MIDDLE  ALT=\"3%2B1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4 ALIGN=MIDDLE  ALT=\"4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=given ALIGN=MIDDLE  ALT=\"given\"   DISABLED_style= \"max-width:90%; height:auto;\" ><IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=total ALIGN=MIDDLE  ALT=\"total\"   DISABLED_style= \"max-width:90%; height:auto;\" ><IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=time ALIGN=MIDDLE  ALT=\"time\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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