document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1185095>Question 1185095</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boat travels between two cities that are 11 miles apart. When going downstream, with the current, the trip takes  11/17 hour(s). Returning upstream, against the current, the boat covers the same distance in 11/15<BR>\n" );
document.write( "  hour(s).\r<BR>\n" );
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document.write( "What is the current of the river? \r<BR>\n" );
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document.write( "What is 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 #815847 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=815847\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A boat travels between two cities that are 11 miles apart.<BR>\n" );
document.write( " When going downstream, with the current, the trip takes 11/17 hour(s).<BR>\n" );
document.write( " Returning upstream, against the current, the boat covers the same distance in 11/15 hour(s).<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Let s = speed of the boat in still water<BR>\n" );
document.write( "let c = the rate of the current<BR>\n" );
document.write( "then<BR>\n" );
document.write( "(s+c) = speed downstream<BR>\n" );
document.write( "and<BR>\n" );
document.write( "(s-c) = speed upstream<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Write a two dist equations, dist = time * speed<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=11%2F17 ALIGN=MIDDLE  ALT=\"11%2F17\"   DISABLED_style= \"max-width:90%; height:auto;\" >(s+c) = 11<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=11%2F15 ALIGN=MIDDLE  ALT=\"11%2F15\"   DISABLED_style= \"max-width:90%; height:auto;\" >(s-c) = 11<BR>\n" );
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document.write( "s + c = 11 * <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=17%2F11 ALIGN=MIDDLE  ALT=\"17%2F11\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "s + c = 17<BR>\n" );
document.write( "and<BR>\n" );
document.write( "s - c = 11 * <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=15%2F11 ALIGN=MIDDLE  ALT=\"15%2F11\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "s - c = 15<BR>\n" );
document.write( "Use elimination <BR>\n" );
document.write( "s + c = 17<BR>\n" );
document.write( "s - c = 15<BR>\n" );
document.write( "-------------addition eliminates c, find s<BR>\n" );
document.write( "2s + 0 = 32<BR>\n" );
document.write( "s = 32/2<BR>\n" );
document.write( "s = 16 mph is the boat speed in still water<BR>\n" );
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document.write( "find the current<BR>\n" );
document.write( "16 + c = 17<BR>\n" );
document.write( "c = 17 - 16<BR>\n" );
document.write( "c = 1 mph is the current<BR>\n" );
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document.write( "Check the solutions in the equation:<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=11%2F17 ALIGN=MIDDLE  ALT=\"11%2F17\"   DISABLED_style= \"max-width:90%; height:auto;\" >(s+c) = 11<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=11%2F17 ALIGN=MIDDLE  ALT=\"11%2F17\"   DISABLED_style= \"max-width:90%; height:auto;\" >(16+1) = 11<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=11%2F17 ALIGN=MIDDLE  ALT=\"11%2F17\"   DISABLED_style= \"max-width:90%; height:auto;\" >(17) = 11<BR>\n" );
document.write( "17 cancels<BR>\n" );
document.write( "11 = 11 </SPAN>\n" );
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