document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=721084>Question 721084</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boat travels 24 mi downstream in 3 hrs and returns in 12 hrs.  Speed of the stream?\r<BR>\n" );
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document.write( "time = x<BR>\n" );
document.write( "speed of stream = y<BR>\n" );
document.write( "3x + y =24<BR>\n" );
document.write( "12x + y = 24\r<BR>\n" );
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document.write( "Have no idea what to do.  Help.\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #442181 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=442181\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A boat travels 24 mi downstream in 3 hrs and returns in 12 hrs.  Speed of the stream?<BR>\n" );
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document.write( "The speed of the boat (wrt the land) is the average of the speed up & downstream.<BR>\n" );
document.write( "24/3 = 8 mi/hr<BR>\n" );
document.write( "24/12 = 2 mi/hr<BR>\n" );
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document.write( "Boat's speed = (8+2)/2 = 5 mi/hr<BR>\n" );
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document.write( "The current is the difference<BR>\n" );
document.write( "8 - 5 = 3 mi/hr<BR>\n" );
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