document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=854743>Question 854743</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A ship travels between two ports. The cost of fuel is 100(ax+b/x+10)dollar, where x is the average speed of the ship in knots, and a and b are constants. if the travels at 4 knots, the cost of fuel would be $9000, but at 6 knots, the cost would be $7000.<BR>\n" );
document.write( "1) find the values of a and b<BR>\n" );
document.write( "2) what is the cost of fuel at an average speed of 5 knots?\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 #515188 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=515188\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 9000=100((4a+b)/(4+10)),<BR>\n" );
document.write( "7000=100((6a+b)/(6+10))\r<BR>\n" );
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document.write( "C=100((5a+b)/(5+10))<BR>\n" );
document.write( "a = -70,   b = 1540,   C = 23800/3=7933.33 </SPAN>\n" );
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