document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=289377>Question 289377</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a motor boat goes 5 miles upstream in the same time it requires to go 7 miles downstream. if the river flows at 2 mph, find the speed of the boat 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 #209600 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=209600\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let the speed of the boat be x mph in still water\r<BR>\n" );
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document.write( "upstream the speed will be x-2 mph\r<BR>\n" );
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document.write( "downstream the speed will be x+2\r<BR>\n" );
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document.write( "time taken both ways is the same.  ( distance / speed = time)\r<BR>\n" );
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document.write( "5/x-2 =7/ x+2\r<BR>\n" );
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document.write( "5(x+2)=7(x-2)\r<BR>\n" );
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document.write( "5x+10=7x-14\r<BR>\n" );
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document.write( "-2x=-24\r<BR>\n" );
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document.write( "x=12 mph\r<BR>\n" );
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document.write( " </SPAN>\n" );
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