document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1057917>Question 1057917</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me.<BR>\n" );
document.write( "A truck travels 450 km to a delivery point, unloads, and, now empty, returns to the starting point at a speed 8.00 km/h greater than on the outward trip. What was the speed of the outward trip if the total round-trip driving time was 14.4 h? Keep three significant digits. <BR>\n" );
document.write( " Upper R 1 = <BR>\n" );
document.write( " km/h<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 #672919 by </B><A HREF=/tutors/aboutme.mpl?userid=jorel555><B>jorel555(1290)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jorel555><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=672919\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let s be the speed of the truck going toward the delivery point. Then the return trip would be s+8. So:<BR>\n" );
document.write( "450/s + 450/s+8=14.4<BR>\n" );
document.write( "450(s+8)+450s=14.4sē+115.2s<BR>\n" );
document.write( "14.4sē-784.8s-3600=0<BR>\n" );
document.write( "144sē-7848s-36000=0 <BR>\n" );
document.write( "Using the quadratic formula, we get two roots as a solution:-4.25495992697 and 58.754959927. Discarding the negative result, we get the outward trip speed as 58.755 kph. &#9786;&#9786;&#9786;&#9786; </SPAN>\n" );
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