document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=518399>Question 518399</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A TRUCK DRIVER TRAVELED AT 40mph for the first part of a 646-miletrip, then increased his speed to 58 mph for the rest of the trip. the entire trip took 13 hours. how many hours are traveled at 58 mph? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #345149 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=345149\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A TRUCK DRIVER TRAVELED AT 40mph for the first part of a 646-miletrip, then increased his speed to 58 mph for the rest of the trip. the entire trip took 13 hours. how many hours are traveled at 58 mph?<BR>\n" );
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document.write( "d = distance at 58 mi/hr<BR>\n" );
document.write( "d/58 + (646-d)/40 = 13<BR>\n" );
document.write( "Multiply by 58*40<BR>\n" );
document.write( "40d + 58*(646-d) = 13*40*58 = 30160<BR>\n" );
document.write( "40d - 58d + 37468 = 30160<BR>\n" );
document.write( "-18d = -7308<BR>\n" );
document.write( "d = 406 miles<BR>\n" );
document.write( "406 mi/58 mi/hr = 7 hours </SPAN>\n" );
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