document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1093051>Question 1093051</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A car travels half of the distance with speed of 54km/h. what would be the speed for second half to get the average speed of 90km /h for whole journey.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #707668 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=707668\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A car travels half of the distance with speed of 54km/h. what would be the speed for second half to get the average speed of 90km /h for whole journey.<BR>\n" );
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document.write( "d = 1/2 the distance<BR>\n" );
document.write( "r = speed of 2nd half<BR>\n" );
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document.write( "d/54 + d/r = 2d/90 = d/45<BR>\n" );
document.write( "1/54 + 1/r = 1/45<BR>\n" );
document.write( "(r+54)/54r = 1/45<BR>\n" );
document.write( "r+54 = 54r/45 = 6r/5<BR>\n" );
document.write( "5r + 270 = 6r<BR>\n" );
document.write( "r = 270 km/hr<BR>\n" );
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document.write( "Check:<BR>\n" );
document.write( "Avg speed = 2*54*270/(54+270) = 90<BR>\n" );
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