document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=321989>Question 321989</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a boat can go 9 km. downstream in 45 mins. & return in an hour. find the speed of the boat in still water and the speed of the current. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #230500 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16949)</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=230500\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a boat can go 9 km. downstream in 45 mins.<BR>\n" );
document.write( " return 9 km in an hour. <BR>\n" );
document.write( "let speed of boat in still water be x mph<BR>\n" );
document.write( "speed of current be y mph<BR>\n" );
document.write( "..<BR>\n" );
document.write( "9/ x+y= 3/4<BR>\n" );
document.write( "36=3(x+y)<BR>\n" );
document.write( "12 = x+y......... equation 1<BR>\n" );
document.write( "9/x-y= 1<BR>\n" );
document.write( "x-y=9.............equation 2<BR>\n" );
document.write( "Add the two equations <BR>\n" );
document.write( "x+y+x-y=12+9<BR>\n" );
document.write( "2x=21<BR>\n" );
document.write( "x=10.5 mph<BR>\n" );
document.write( "..<BR>\n" );
document.write( "x-y=9<BR>\n" );
document.write( "plug the value of x<BR>\n" );
document.write( "10.5-y=9 <BR>\n" );
document.write( "y=1.5 mph </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );