document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=508467>Question 508467</A>: <I><SPAN STYLE=\"word-break: break-all;\"> it takes 3 hours for a boat to ravel 27 mile upstram. the same boat can travel 30 miles down stream in 2 hours fond the speed of the boat and 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 #341021 by </B><A HREF=/tutors/aboutme.mpl?userid=Maths68><B>Maths68(1474)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Maths68><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=Maths68><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=341021\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let<BR>\n" );
document.write( "Speed of boat = b<BR>\n" );
document.write( "Speed of current = c\r<BR>\n" );
document.write( "\n" );
document.write( "Given\r<BR>\n" );
document.write( "\n" );
document.write( "Upstream<BR>\n" );
document.write( "=====================================================<BR>\n" );
document.write( "Distance = 27 miles<BR>\n" );
document.write( "Time = 3 hours\r<BR>\n" );
document.write( "\n" );
document.write( "Speed = Distance/time<BR>\n" );
document.write( "Speed = 27/3<BR>\n" );
document.write( "Speed = 9 miles per hour<BR>\n" );
document.write( "We can say boat speed minus the speed of current<BR>\n" );
document.write( "b-c=9..........(1)\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Downstream<BR>\n" );
document.write( "=====================================================<BR>\n" );
document.write( "Distance = 30 hours<BR>\n" );
document.write( "Time = 2 hours<BR>\n" );
document.write( "Speed = Distance/time<BR>\n" );
document.write( "Speed = 30/2<BR>\n" );
document.write( "Speed = 15 miles per hour<BR>\n" );
document.write( "We can say boat speed plus the speed of current<BR>\n" );
document.write( "b+c=15.............(2)\r<BR>\n" );
document.write( "\n" );
document.write( "Add (1) and (2)<BR>\n" );
document.write( "b-c=9..........(1)<BR>\n" );
document.write( "b+c=15.............(2)<BR>\n" );
document.write( "---------<BR>\n" );
document.write( "2b=24<BR>\n" );
document.write( "b=24/2<BR>\n" );
document.write( "b=12\r<BR>\n" );
document.write( "\n" );
document.write( "Put the value of b in (2)<BR>\n" );
document.write( "b+c=15.............(2)<BR>\n" );
document.write( "12+c=15<BR>\n" );
document.write( "c=15-12<BR>\n" );
document.write( "c=3<BR>\n" );
document.write( "===================================================<BR>\n" );
document.write( "Speed of boat = b = 12 miles / hour<BR>\n" );
document.write( "Speed of current = c = 3 miles / hour\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );