document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1159341>Question 1159341</A>: <I><SPAN STYLE=\"word-break: break-all;\"> hello, how are you? i need a help please :<BR>\n" );
document.write( "Driving at a speed of 40 km / h, you need half an hour to reach the home. With what speed do you have to drive to get home in 20 minutes? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #782359 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=782359\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "Informally, using common sense -- as tutor @ikleyn says:<br><BR>\n" );
document.write( "The distance is the same; the time is 2/3 as much (20 minutes instead of 30). That means the speed has to be 3/2 as much.<br><BR>\n" );
document.write( "40kmh * 3/2 = 60kmh<br><BR>\n" );
document.write( "ANSWER: 60 km/hr<br><BR>\n" );
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