document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=777758>Question 777758</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A motorboat goes 5 miles upstream in the same time it requires to go 7 miles downsteam.  If the river flows 2 mph, find the speed of the boat still in the water. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #474284 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=474284\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A motorboat goes 5 miles upstream in the same time it requires to go 7 miles downsteam. If the river flows 2 mph, find the speed of the boat still in the water.<BR>\n" );
document.write( "***<BR>\n" );
document.write( "let x=speed of boat in still water<BR>\n" );
document.write( "x+2=speed of boat downstream<BR>\n" );
document.write( "x-2=speed of boat upstream<BR>\n" );
document.write( "travel time=distance/speed (same for upstream and downstream travel)<BR>\n" );
document.write( "..<BR>\n" );
document.write( "5/(x-2)=7/(x+2)<BR>\n" );
document.write( "7x-14=5x+10<BR>\n" );
document.write( "2x=24<BR>\n" );
document.write( "x=12<BR>\n" );
document.write( "speed of boat in still water=12 mph </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );