document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1192914>Question 1192914</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A kayak can travel 30  miles downstream in 2 ​hours, while it would take 10 hours to make the same trip upstream. Find the speed of the kayak in still​ water, as well as the speed of the current. Let k represent the speed of the kayak in still​ water, and let c represent the speed of the current.\r<BR>\n" );
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document.write( "What is speed of the kayak in still​ water?<BR>\n" );
document.write( "When a plane flies with the​ wind, it can travel 1680  miles in 4 hours. When the plane flies in the opposite​ direction, against the​ wind, it takes 5 hours to fly the same distance. Find the rate of the plane in still air and the rate of the wind.\r<BR>\n" );
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document.write( "The rate of the wind is ____ miles per hour. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #824850 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39617)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=824850\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">\r\n" );
document.write( "                SPEED      TIME       DISTANCE\r\n" );
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document.write( "DOWNSTREAM       k+c        2          2(k+c)=30\r\n" );
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document.write( "UPSTREAM         k-c       10         10(k-c)=30\r\n" );
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document.write( "The distances are equal.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%282%28k%2Bc%29=30%2C10%28k-c%29=30%29 ALIGN=MIDDLE  ALT=\"system%282%28k%2Bc%29=30%2C10%28k-c%29=30%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28k%2Bc=15%2Ck-c=3%29 ALIGN=MIDDLE  ALT=\"system%28k%2Bc=15%2Ck-c=3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >--------solve this for k and c. </SPAN>\n" );
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