document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=820274>Question 820274</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A tour boat travels downstream and turns around and travels back upstream. Each trip is 20 miles, (40 miles total), the current is 5 miles per hour. The length of the tour in hours is a function of the still water speed of the tour boat. Write a function and define the variable you use.\r<BR>\n" );
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document.write( "I'm having difficulty writing this into a function, as (to me) there are variables missing. I'm not a word problem person! haha Thank you so much for taking the time to help me!  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #493451 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=493451\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> When the boat goes upstream, the rate <BR>\n" );
document.write( "of the current gets subtracted<BR>\n" );
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document.write( "When the boat goes downstream, the<BR>\n" );
document.write( "rate of the current gets added<BR>\n" );
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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 speed of the boat in still water<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t%5B1%5D+ ALIGN=MIDDLE  ALT=\"+t%5B1%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the time to go downstream<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t%5B2%5D+ ALIGN=MIDDLE  ALT=\"+t%5B2%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the time to go upstream<BR>\n" );
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document.write( "Equation for going downstream:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+20+=+%28+s+%2B+5+%29%2At%5B1%5D+ ALIGN=MIDDLE  ALT=\"+20+=+%28+s+%2B+5+%29%2At%5B1%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Equation for going upstream:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+20+=+%28+s+-+5+%29%2At%5B2%5D+ ALIGN=MIDDLE  ALT=\"+20+=+%28+s+-+5+%29%2At%5B2%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "What you're looking for is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+T+=+t%5B1%5D+%2B+t%5B2%5D+ ALIGN=MIDDLE  ALT=\"+T+=+t%5B1%5D+%2B+t%5B2%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" >,<BR>\n" );
document.write( "the time for the whole trip<BR>\n" );
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document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t%5B1%5D+=+20%2F%28+s%2B5+%29+ ALIGN=MIDDLE  ALT=\"+t%5B1%5D+=+20%2F%28+s%2B5+%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=+t%5B2%5D+=+20%2F%28+s-5+%29+ ALIGN=MIDDLE  ALT=\"+t%5B2%5D+=+20%2F%28+s-5+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+T+=+20%2F%28+s%2B5+%29+%2B+20%2F%28+s-5+%29+ ALIGN=MIDDLE  ALT=\"+T+=+20%2F%28+s%2B5+%29+%2B+20%2F%28+s-5+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+T+=+20%2A%28+1%2F%28s%2B5%29+%2B+1%2F%28s-5%29%29+ ALIGN=MIDDLE  ALT=\"+T+=+20%2A%28+1%2F%28s%2B5%29+%2B+1%2F%28s-5%29%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "This is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+T+=+f%28s%29+ ALIGN=MIDDLE  ALT=\"+T+=+f%28s%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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