document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=334470>Question 334470</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have a story problem using d=rt, where is the distance, r is the rate and t is the time.\r<BR>\n" );
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document.write( "Suppose you are traveling at an average of 55  miles per hour to your sisters house, and return at an average of 65 miles per hour. The total driving time is 12 hours.  How far, in miles did you travel?\r<BR>\n" );
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document.write( "The only option that even comes close to the answer I get is 660.  I can not figure out how.  \r<BR>\n" );
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document.write( "Please help!! thanks so much! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #239651 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=239651\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You can write 2 equations, 1 for driving to the house and<BR>\n" );
document.write( "1 for returning. The distance is unknown, but it's the <BR>\n" );
document.write( "same for both trips. I'll call the distance <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d ALIGN=MIDDLE  ALT=\"d\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "I'll call the time to drive to the house <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t ALIGN=MIDDLE  ALT=\"t\"   DISABLED_style= \"max-width:90%; height:auto;\" >. Since the<BR>\n" );
document.write( "total driving time is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=12 ALIGN=MIDDLE  ALT=\"12\"   DISABLED_style= \"max-width:90%; height:auto;\" > hrs, the time to drive back<BR>\n" );
document.write( "is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=12+-+t ALIGN=MIDDLE  ALT=\"12+-+t\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Driving to the house:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+r%5B1%5D%2At ALIGN=MIDDLE  ALT=\"d+=+r%5B1%5D%2At\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Drive from the house:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+r%5B2%5D%2A%2812+-+t%29 ALIGN=MIDDLE  ALT=\"d+=+r%5B2%5D%2A%2812+-+t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "given:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5B1%5D+=+55 ALIGN=MIDDLE  ALT=\"r%5B1%5D+=+55\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi/hr<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5B2%5D+=+65 ALIGN=MIDDLE  ALT=\"r%5B2%5D+=+65\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi/hr<BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "Now I can write:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+55t ALIGN=MIDDLE  ALT=\"d+=+55t\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+65%2A%2812+-+t%29 ALIGN=MIDDLE  ALT=\"d+=+65%2A%2812+-+t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "I can set (1) and (2) equal to eachother:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=55t+=+65%2A%2812+-+t%29 ALIGN=MIDDLE  ALT=\"55t+=+65%2A%2812+-+t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=55t+=+780+-+65t ALIGN=MIDDLE  ALT=\"55t+=+780+-+65t\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=120t+=+780 ALIGN=MIDDLE  ALT=\"120t+=+780\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+6.5 ALIGN=MIDDLE  ALT=\"t+=+6.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "It took 6.5 hrs to drive to the house.<BR>\n" );
document.write( "Now find <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d ALIGN=MIDDLE  ALT=\"d\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+55t ALIGN=MIDDLE  ALT=\"d+=+55t\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+55%2A6.5 ALIGN=MIDDLE  ALT=\"d+=+55%2A6.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+357.5 ALIGN=MIDDLE  ALT=\"d+=+357.5\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi<BR>\n" );
document.write( "You drove the same distance coming back, so<BR>\n" );
document.write( "the total distance is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2d ALIGN=MIDDLE  ALT=\"2d\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2d+=+2%2A357.5 ALIGN=MIDDLE  ALT=\"2d+=+2%2A357.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2d+=+715 ALIGN=MIDDLE  ALT=\"2d+=+715\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "You drove 715 mi<BR>\n" );
document.write( "check answer:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2d+=+55t+%2B+65%2A%2812+-+t%29 ALIGN=MIDDLE  ALT=\"2d+=+55t+%2B+65%2A%2812+-+t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=715+=+55%2A6.5+%2B+65%2A%2812+-+6.5%29 ALIGN=MIDDLE  ALT=\"715+=+55%2A6.5+%2B+65%2A%2812+-+6.5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=715+=+357.5+%2B+65%2A5.5 ALIGN=MIDDLE  ALT=\"715+=+357.5+%2B+65%2A5.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=715+=+357.5+%2B+357.5 ALIGN=MIDDLE  ALT=\"715+=+357.5+%2B+357.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=715+=+715 ALIGN=MIDDLE  ALT=\"715+=+715\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK  </SPAN>\n" );
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