document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=158306>Question 158306</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Danielle drove from school to home averaging 20 mph.  On the way back to school she averaged 30 mph.  If the total driving time was 1.5 hours, how long did it take her to drive each way.\r<BR>\n" );
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document.write( "(i'm in 8th grade, and it just doesn't make sense to me)  But I think this is what I am supposed to do, but I don't understand why it works.. if it does.<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #116669 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=116669\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Danielle drove from school to home averaging 20 mph. On the way back to school she averaged 30 mph. If the total driving time was 1.5 hours, how long did it take her to drive each way. <BR>\n" );
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document.write( "School to home DATA:<BR>\n" );
document.write( "rate = 20 mph ; distance = x miles ; time = d/r = x/20 hrs<BR>\n" );
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document.write( "home to school DATA:<BR>\n" );
document.write( "rate = 30 mph ; distance = x miles ; time = d/r = x/30 hrs<BR>\n" );
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document.write( "EQUATION:<BR>\n" );
document.write( "time + time = 1.5 hours<BR>\n" );
document.write( "x/20 + x/30 = 3/2<BR>\n" );
document.write( "Multiply thru by 60 to get:<BR>\n" );
document.write( "3x + 2x = 90<BR>\n" );
document.write( "5x = 90 <BR>\n" );
document.write( "x = 18 miles (distance each way)<BR>\n" );
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document.write( "time to drive from home to school = 18/20 = 9/10 hr = 54 minutes<BR>\n" );
document.write( "time to drive from school to home = 18/30 = 3/5 hr = 36 minutes<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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