document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1194880>Question 1194880</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A motorboat can maintain a constant speed of 46 miles per hour relative to the water.  The boat makes a trip upstream to a certain point in 48 ​minutes; the return trip takes 44 minutes.  What is the speed of the​ current </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #827171 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39800)</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=827171\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Same thing, just all as variables.\r<BR>\n" );
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document.write( "A vehicle can maintain a constant speed of R miles per hour relative to the<BR>\n" );
document.write( " water. The vehicle makes a trip upstream to a certain point in U ​minutes; the return trip takes B minutes. What is the speed of the​ current, c ?<BR>\n" );
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document.write( "d, the distance of the \"certain trip\"<BR>\n" );
document.write( "U=48 min<BR>\n" );
document.write( "B=44 min<BR>\n" );
document.write( "R=46 mph<BR>\n" );
document.write( "c, unknown speed of current\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28R-c=d%2F%28U%2F60%29%2CR%2Bc=d%2F%28B%2F60%29%29 ALIGN=MIDDLE  ALT=\"system%28R-c=d%2F%28U%2F60%29%2CR%2Bc=d%2F%28B%2F60%29%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=%28U%2F60%29%28R-c%29=d%2C%28B%2F60%29%28R%2Bc%29=d ALIGN=MIDDLE  ALT=\"%28U%2F60%29%28R-c%29=d%2C%28B%2F60%29%28R%2Bc%29=d\"   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=U%28R-c%29=d%2CB%28R%2Bc%29=d ALIGN=MIDDLE  ALT=\"U%28R-c%29=d%2CB%28R%2Bc%29=d\"   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=UR-Uc=BR%2BBc ALIGN=MIDDLE  ALT=\"UR-Uc=BR%2BBc\"   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=UR-BR=Bc%2BUc ALIGN=MIDDLE  ALT=\"UR-BR=Bc%2BUc\"   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=%28UR-BR%29%2F%28B%2BU%29=c ALIGN=MIDDLE  ALT=\"%28UR-BR%29%2F%28B%2BU%29=c\"   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=OR ALIGN=MIDDLE  ALT=\"OR\"   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=highlight%28c=R%28%28U-B%29%2F%28U%2BB%29%29%29 ALIGN=MIDDLE  ALT=\"highlight%28c=R%28%28U-B%29%2F%28U%2BB%29%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >------and you just plug in the given values and find c.\r<BR>\n" );
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document.write( "Many people would choose to use the given values at the beginning, instead of solving the example all in variables.\r<BR>\n" );
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document.write( "Usually one would do like so:<BR>\n" );
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document.write( "              SPEED            TIME          DISTANCE\r\n" );
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document.write( "upstream        (46-c)          (48/60)         d\r\n" );
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document.write( "downstream      (46+c)          (44/60)         d\r\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=46=23c ALIGN=MIDDLE  ALT=\"46=23c\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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