document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=222063>Question 222063</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Debbie traveled by Boat 5 miles upstream to fish.  Because of the 4mph current, it took her 20 minutes longer to get there than to return.  How fast will her boat go in still water? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #166436 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=166436\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Debbie traveled by boat 5 miles upstream to fish.<BR>\n" );
document.write( " Because of the 4 mph current, it took her 20 minutes longer to get there<BR>\n" );
document.write( " than to return. <BR>\n" );
document.write( "How fast will her boat go in still water?<BR>\n" );
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document.write( "Let s = boat speed in still water<BR>\n" );
document.write( "then<BR>\n" );
document.write( "(s-4) = speed upstream<BR>\n" );
document.write( "and<BR>\n" );
document.write( "(s+4) = speed down stream<BR>\n" );
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document.write( "Convert 20 min to hrs: 20/60 = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F3 ALIGN=MIDDLE  ALT=\"1%2F3\"   DISABLED_style= \"max-width:90%; height:auto;\" >hr<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Write a time equation: time = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=distance%2Fspeed ALIGN=MIDDLE  ALT=\"distance%2Fspeed\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Upstream time = downstream time + 20 minutes (1/3 hr)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5%2F%28%28s-4%29%29 ALIGN=MIDDLE  ALT=\"5%2F%28%28s-4%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5%2F%28%28s%2B4%29%29 ALIGN=MIDDLE  ALT=\"5%2F%28%28s%2B4%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F3 ALIGN=MIDDLE  ALT=\"1%2F3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ":<BR>\n" );
document.write( "To clear out these denominators, multiply equation by 3(s+4)(s-4)<BR>\n" );
document.write( "3(s+4)(s-4)*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5%2F%28%28s-4%29%29 ALIGN=MIDDLE  ALT=\"5%2F%28%28s-4%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 3(s+4)(s-4)*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5%2F%28%28s%2B4%29%29 ALIGN=MIDDLE  ALT=\"5%2F%28%28s%2B4%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F3 ALIGN=MIDDLE  ALT=\"1%2F3\"   DISABLED_style= \"max-width:90%; height:auto;\" >*3(s+4)(s-4)<BR>\n" );
document.write( "Results in<BR>\n" );
document.write( ":<BR>\n" );
document.write( "15(s+4) = 15(s-4) + (s+4)(s-4)<BR>\n" );
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document.write( "15s + 60 = 15s - 60 + s^2 - 16<BR>\n" );
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document.write( "0 = 15s - 15s - 60 - 60 + s^2 - 16<BR>\n" );
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document.write( "0 = s^2 - 136<BR>\n" );
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document.write( "s^2 = 136<BR>\n" );
document.write( "s = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%28136%29 ALIGN=MIDDLE  ALT=\"sqrt%28136%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "s = 11.66 mph speed in still water<BR>\n" );
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document.write( "Check solution on calc: (speed up = 7.66 and speed down = 15.66)<BR>\n" );
document.write( "5/7.66 - 5/15.66 = .3333 which is 1/3 of an hr<BR>\n" );
document.write( " </SPAN>\n" );
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