document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=214890>Question 214890</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me this word problem: Kevin drove 320 miles to a mountain resort. His return trip took 20 minutes longer because his speed returning was 4 mi/h slower than his speed going. \r<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 #162332 by </B><A HREF=/tutors/aboutme.mpl?userid=RAY100><B>RAY100(1637)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=RAY100><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=162332\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Velocity  =  Distance / Time,,,,or  T = D/V<BR>\n" );
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document.write( "(1) T1 = 320 / V1<BR>\n" );
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document.write( "(2) T2 = 320 / V2,,,,,but  T2 = T1 + 20/60 (hrs) ,,,and  V2 = V1 -4<BR>\n" );
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document.write( "subst  in  (2)<BR>\n" );
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document.write( "{ T1 + 20/60} = 320 / {V1-4},,,and  T1 = 320 /V!<BR>\n" );
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document.write( "{ (320/V1) +20/60 } = 320 /{V1-4)<BR>\n" );
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document.write( "Multiply  thru  by  (3) V1(V1-4)<BR>\n" );
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document.write( "(320 (3) (V1-4) + 1(V1)(V1-4) = 320 (3)(V1)<BR>\n" );
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document.write( "960 V1 - 3840 + V1^2 -4V1 = 960V1<BR>\n" );
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document.write( "v1^2 -4V1 -3840 =0,,,,,factor<BR>\n" );
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document.write( "(V1 -64)(V1+60) =0<BR>\n" );
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document.write( "V1= 64,  -60 ( not  practical)<BR>\n" );
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document.write( "check,,,V1= 64,,,V2 = 60 <BR>\n" );
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document.write( "T1 = 320 /64 = 5  hrs<BR>\n" );
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document.write( "T2 = 5 hrs + 1/3  hr = 5.33  hrs<BR>\n" );
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document.write( "T2 = 320 / 60 = 5.333,,,,,ok<BR>\n" );
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