document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=804120>Question 804120</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A swimmer can swim a distance of 36 kilometer in the direction of water current in the same time, which he requires to swim 36 kilometers in the opposite direction of water current in stream. If in still water, swimmer has speed of 12 kilometer/ hour more than the speed of that of water in stream, the what is the speed of water?<BR>\n" );
document.write( "A. 3Km/hr<BR>\n" );
document.write( "B. 9 Km/hr<BR>\n" );
document.write( "C. 12 Km/hr<BR>\n" );
document.write( "D. 18 Km/hr\r<BR>\n" );
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document.write( "help me plz to solve this question.... </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #484632 by </B><A HREF=/tutors/aboutme.mpl?userid=KMST><B>KMST(5328)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=KMST><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=KMST><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=484632\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Something is very wrong with this problem.<BR>\n" );
document.write( "Maybe something got lost in translation.<BR>\n" );
document.write( "To begin, no human swimmer can swim at 12 km/hour in still water. Not even for a short distance. Not even an Olympic champion. The swimmer in the problem must not be a human.<BR>\n" );
document.write( "Something is very wrong with this problem, even if the swimmer is much faster than any human.<BR>\n" );
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document.write( "If there is a current, in the same time, the swimmer will go much farther in the direction of water current than when swimming in the opposite direction.<BR>\n" );
document.write( "If the swimmer can go 36 kilometers in the same time, with or against the current, then the current goes so slow that the swimmer does not notice the current.<BR>\n" );
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document.write( "If in still water the swimmer has a speed of 12 kilometer/ hour more than the speed of that of water in stream, and the speed of the stream is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x ALIGN=MIDDLE  ALT=\"x\"   DISABLED_style= \"max-width:90%; height:auto;\" > kilometer/ hour, the speed of the swimmer with respect to the ground on the edges of the stream will be<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=12%2Bx ALIGN=MIDDLE  ALT=\"12%2Bx\"   DISABLED_style= \"max-width:90%; height:auto;\" > kilometer/ hour in still water the swimmer,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=12%2Bx%2Bx=12%2B2x ALIGN=MIDDLE  ALT=\"12%2Bx%2Bx=12%2B2x\"   DISABLED_style= \"max-width:90%; height:auto;\" > kilometer/ hour in the direction of water current, and<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=12%2Bx-x=12 ALIGN=MIDDLE  ALT=\"12%2Bx-x=12\"   DISABLED_style= \"max-width:90%; height:auto;\" > kilometer/ hour in the opposite direction of water current in stream.<BR>\n" );
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document.write( "With the same speed of the stream, it will take the swimmer a longer time to cover the same 36 kilometers when swimming against the current. How much longer depends on the current.<BR>\n" );
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document.write( "It will take the swimmer<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=36%2F12=3%29 ALIGN=MIDDLE  ALT=\"36%2F12=3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > hours to swim a distance of 36 kilometer in the opposite direction of water current in stream.<BR>\n" );
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document.write( "It will take the swimmer a shorter time,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=36%2F%2812%2B2x%29 ALIGN=MIDDLE  ALT=\"36%2F%2812%2B2x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > hours, to swim a distance of 36 kilometer in the direction of water current.<BR>\n" );
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document.write( "If it takes the swimmer <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t ALIGN=MIDDLE  ALT=\"t\"   DISABLED_style= \"max-width:90%; height:auto;\" > hours longer to cover the same 36 kilometers when swimming against the current,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=36%2F%2812%2B2x%29=3-t ALIGN=MIDDLE  ALT=\"36%2F%2812%2B2x%29=3-t\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "If we know <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x ALIGN=MIDDLE  ALT=\"x\"   DISABLED_style= \"max-width:90%; height:auto;\" > we can calculate <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t ALIGN=MIDDLE  ALT=\"t\"   DISABLED_style= \"max-width:90%; height:auto;\" > as <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=3-36%2F%2812%2B2x%29 ALIGN=MIDDLE  ALT=\"t=3-36%2F%2812%2B2x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "If we know <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t ALIGN=MIDDLE  ALT=\"t\"   DISABLED_style= \"max-width:90%; height:auto;\" > we can calculate <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x ALIGN=MIDDLE  ALT=\"x\"   DISABLED_style= \"max-width:90%; height:auto;\" > as <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=18%2F%283-t%29-6 ALIGN=MIDDLE  ALT=\"18%2F%283-t%29-6\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "If the stream speed is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=3 ALIGN=MIDDLE  ALT=\"x=3\"   DISABLED_style= \"max-width:90%; height:auto;\" >, then the downstream swim takes 2 hours and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=1 ALIGN=MIDDLE  ALT=\"t=1\"   DISABLED_style= \"max-width:90%; height:auto;\" > is the difference.<BR>\n" );
document.write( "For <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=9 ALIGN=MIDDLE  ALT=\"x=9\"   DISABLED_style= \"max-width:90%; height:auto;\" >, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=1.8 ALIGN=MIDDLE  ALT=\"t=1.8\"   DISABLED_style= \"max-width:90%; height:auto;\" > and the swim downstream takes only 1.2 hours.<BR>\n" );
document.write( "For <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=12 ALIGN=MIDDLE  ALT=\"x=12\"   DISABLED_style= \"max-width:90%; height:auto;\" >, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=2 ALIGN=MIDDLE  ALT=\"t=2\"   DISABLED_style= \"max-width:90%; height:auto;\" > and the swim downstream takes only 1 hour.<BR>\n" );
document.write( "For <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=18 ALIGN=MIDDLE  ALT=\"x=18\"   DISABLED_style= \"max-width:90%; height:auto;\" >, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=2.25 ALIGN=MIDDLE  ALT=\"t=2.25\"   DISABLED_style= \"max-width:90%; height:auto;\" > and the swim downstream takes only 0.75 hours (45 minutes).\r<BR>\n" );
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