document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=65812>Question 65812</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/093979862x/algebrahomeworkh>An Incremental Development</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> A paddleboat can travel 60 miles upstream in the same time it takes to travel 140 miles downstream. If the current of the river is 10 miles per hour, what is the speed of the paddleboat in still water? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #46532 by </B><A HREF=/tutors/aboutme.mpl?userid=uma><B>uma(370)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=uma><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=46532\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let the speed of the boat be x mph<BR>\n" );
document.write( "Speed of river = 10 mph<BR>\n" );
document.write( "Relative speed upstream = (x-10) mph<BR>\n" );
document.write( "Distance covered upstream = 60<BR>\n" );
document.write( "So time taken = distance/speed<BR>\n" );
document.write( "              = 60/(x-10) hrs\r<BR>\n" );
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document.write( "Relative speed downstream = (x+10) mph<BR>\n" );
document.write( "Distance covered = 140 miles<BR>\n" );
document.write( "Time taken = 140/(x+10) hrs\r<BR>\n" );
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document.write( "==> 140/(x+ 10) = 60/(x-10)<BR>\n" );
document.write( "==> 140(x-10) = 60(x+10)<BR>\n" );
document.write( "==> 140 x - 1400 = 60x +600<BR>\n" );
document.write( "==> 140x - 60x = 600 + 1400<BR>\n" );
document.write( "==> 80x = 2000<BR>\n" );
document.write( "==> 80x/80 = 2000/80<BR>\n" );
document.write( "==> x = 25\r<BR>\n" );
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document.write( "So speed of the boat = 25 mph\r<BR>\n" );
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document.write( "Good Luck!!!  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );