document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=169828>Question 169828</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Help please,\r<BR>\n" );
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document.write( "The speed of the current in a river is 2mph.  Jay travels 20 miles upstream and then 20 miles downstream in a total time of  hours.  Find the speed of the boat.<BR>\n" );
document.write( "Let s be the speed of the boat.\r<BR>\n" );
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document.write( "Thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #125232 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=125232\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> BELIEVE YOU LEFT OUT THE HOUR FIGURE????<BR>\n" );
document.write( "The speed of the current in a river is 2mph.  Jay travels 20 miles upstream and then 20 miles downstream in a total time of 5 1/3 hours.  Find the speed of the boat. Let s be the speed of the boat.<BR>\n" );
document.write( "D=ST<BR>\n" );
document.write( "T=D/S<BR>\n" );
document.write( "5.33=20/(S-2)+20/(S+2)<BR>\n" );
document.write( "5.33=(20[S+2]+20[S-2])/(S+2)(S-2)<BR>\n" );
document.write( "5.33=(20S+40+20S-40)/(S^2-4)<BR>\n" );
document.write( "5.33=40S/(S^2-4)<BR>\n" );
document.write( "5.33S^2-21.333=40S<BR>\n" );
document.write( "5.33S^2-40S-21.333=0<BR>\n" );
document.write( "uSING THE QUADRATIC EQUATION<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S=%28-b%2B-sqrt%28b%5E2-4%2Aa%2Ac%29%29%2F%282%2Aa%29 ALIGN=MIDDLE  ALT=\"S=%28-b%2B-sqrt%28b%5E2-4%2Aa%2Ac%29%29%2F%282%2Aa%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >WE GET:<BR>\n" );
document.write( "S=(40+-SQRT[-40^2-4*5.33*-21.333])/2*5.333<BR>\n" );
document.write( "S=(40+-SQRT[1,600+455])/10.6667<BR>\n" );
document.write( "S=(40+-SQRT2,055)/10.6667<BR>\n" );
document.write( "S=(40+-SQRT45.333)/10.667<BR>\n" );
document.write( "S=(40+45.333)/10.667<BR>\n" );
document.write( "S=85.333/10.667<BR>\n" );
document.write( "S=8 MPH. ANS FOR THE SPEED OF THE BOAT IN CALM WATERS. </SPAN>\n" );
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