document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=405406>Question 405406</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A motorboat goes 5 miles upstream in the same time it requires to 7 miles downstream. If the river flows at 2mph, find the speed of the boat 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 #286332 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=286332\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let the speed of boat be x mph<BR>\n" );
document.write( "speed of current = 2mph\r<BR>\n" );
document.write( "\n" );
document.write( "..<BR>\n" );
document.write( "upstream speed = x-2 mph<BR>\n" );
document.write( "downstream speed = x+2 mph<BR>\n" );
document.write( "..<BR>\n" );
document.write( "Time = distance/speed\r<BR>\n" );
document.write( "\n" );
document.write( "time upstream  time downstrea<BR>\n" );
document.write( "..<BR>\n" );
document.write( "5/(x-2)=7/(x+2)<BR>\n" );
document.write( "cross multiply<BR>\n" );
document.write( "5(x+2)=7(x-2)<BR>\n" );
document.write( "5x+10=7x-14<BR>\n" );
document.write( "2x=24<BR>\n" );
document.write( "/2<BR>\n" );
document.write( "x=12 mph====> speed of boat\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );