document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=113995>Question 113995</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0321319095/algebrahomeworkh>Introductory and Intermediate Algebra</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> The Hudson River flows at a rate of 3mph.  A patrol boat travels 60 miles upriver and returns in a total time of 9 hr.  What is the speed of the boat in still water?\r<BR>\n" );
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document.write( "D= rt upriver - 9r = 60 still water - 3rt = 60<BR>\n" );
document.write( "Have I set this equation up correctly?  Where do I go from here?  Please 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 #82962 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley71><B>checkley71(8403)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley71><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=82962\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> D=RT OR T=D/R<BR>\n" );
document.write( "60/(R-3)+60/(R+3)=9<BR>\n" );
document.write( "[60(R+3)+60(R-3)]/(R-3)(R+3)=9<BR>\n" );
document.write( "(60R+180+60R-180)/(R^2-9)=9 (THE +180 & THE -180 CANCEL OUT)<BR>\n" );
document.write( "120R/(R^2-9)=9 NOW CROSS MULTIPLY<BR>\n" );
document.write( "9R^2-81=120R<BR>\n" );
document.write( "9R^-120R-81=0<BR>\n" );
document.write( "USING THE QUADRATIC EQUATION WE GET:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "R=(120+-SQRT[120^2-4*9*-81])/2*9<BR>\n" );
document.write( "R=(120+-SQRT[14,400+2916])/18<BR>\n" );
document.write( "R=(120+-SQRT17,316)/18<BR>\n" );
document.write( "R=(120+-131.59)/18<BR>\n" );
document.write( "R=(120+131.59)/18<BR>\n" );
document.write( "R=251.59/18<BR>\n" );
document.write( "R=13.977 MPH IS THE SPEED OF THE BOAT IN STILL WATER.<BR>\n" );
document.write( " </SPAN>\n" );
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