document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=830597>Question 830597</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If a boat travels from Town A to Town B, it has to travel 1501.5 mi along a river.\r<BR>\n" );
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document.write( "A boat traveled from Town A to Town B along the river’s current with its engine running at full speed. This trip took 71.5 hr.\r<BR>\n" );
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document.write( "Then the boat traveled back from Town B to Town A, again with the engine at full speed, but this time against the river’s current. This trip took 136.5 hr.\r<BR>\n" );
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document.write( "Write and solve a system of equations to answer the following questions.\r<BR>\n" );
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document.write( "The boat’s speed in still water with the engine running at full speed is?\r<BR>\n" );
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document.write( "The river current’s speed was?\r<BR>\n" );
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document.write( "I tried D/T=R for each. Then I'm stumped from there. I'm really unsure of how to set up this equation. If I could have some help as to how to set it up, I know I can solve it. Thank you! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #500725 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39620)</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=500725\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Same distance both directions, the shorter time was downstream and the longer time was upstream.\r<BR>\n" );
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document.write( "r for boat speed without current<BR>\n" );
document.write( "c for river current speed<BR>\n" );
document.write( "r-c is the speed going upstream<BR>\n" );
document.write( "r+c, downstream.\r<BR>\n" );
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document.write( "_____________________speed_______________time____________distance<BR>\n" );
document.write( "DOWNSTREAM___________r+c_________________71.5____________1501.5<BR>\n" );
document.write( "UPSTREAM_____________r-c________________136.5____________1501.5\r<BR>\n" );
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document.write( "Uniform rates formula for travel is R*t=d, variables understood.  Divide b.s. by t, R=d/t as you already knew.\r<BR>\n" );
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document.write( "Downstream equation is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1501.5%2F71.5=r%2Bc ALIGN=MIDDLE  ALT=\"1501.5%2F71.5=r%2Bc\"   DISABLED_style= \"max-width:90%; height:auto;\" >  <BR>\n" );
document.write( "Upstream equation is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1501.5%2F136.5=r-c ALIGN=MIDDLE  ALT=\"1501.5%2F136.5=r-c\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-<BR>\n" );
document.write( "Computing those to help simplify,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28r%2Bc=21%29 ALIGN=MIDDLE  ALT=\"highlight%28r%2Bc=21%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28r-c=11%29 ALIGN=MIDDLE  ALT=\"highlight%28r-c=11%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Elimination Method would make finishing the solution easiest. </SPAN>\n" );
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