document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1112497>Question 1112497</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The distance between two islands A and B is 36 km. The sea current flows steadily such that a boat can gain a speed of x km/h when it sails from A to B. Mr. Chan sails a boat which takes 1.5 hours to travel from A to B. and then 2 hours from B to A.Find the speed of the boat when there is no sea current. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #727554 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=727554\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The distance between two islands A and B is 36 km.<BR>\n" );
document.write( " The sea current flows steadily such that a boat can gain a speed of x km/h when it sails from A to B.<BR>\n" );
document.write( " Mr. Chan sails a boat which takes 1.5 hours to travel from A to B.<BR>\n" );
document.write( " and then 2 hours from B to A.<BR>\n" );
document.write( " Find the speed of the boat when there is no sea current.  <BR>\n" );
document.write( ":<BR>\n" );
document.write( "let s = the speed of the boat with no current<BR>\n" );
document.write( "then<BR>\n" );
document.write( "(s+x) = effective speed with the current<BR>\n" );
document.write( "and<BR>\n" );
document.write( "(s-x) = effective speed against<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Write a distance equation for each way. dist = time * speed<BR>\n" );
document.write( "1.5(s+x) = 36<BR>\n" );
document.write( "2(s-x) = 36<BR>\n" );
document.write( "simplify both equations divide the first by 1.5, divide the second by 2<BR>\n" );
document.write( "s + x = 24<BR>\n" );
document.write( "s - x = 18<BR>\n" );
document.write( "---------------Addition eliminates x, find s<BR>\n" );
document.write( "2s + 0 = 42<BR>\n" );
document.write( "s = 42/2<BR>\n" );
document.write( "s = 21 km/hr is the speed of the boat in still water </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );