document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=633948>Question 633948</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Question: Mary travels from the city to visit her sister in the country. On the way, she travels 55km/hr. She stays with her sister for 20 hours before starting home. On the return trip, she travels 45 km/hr. She returned home a grand total of 41 hours after she left. How far away, in kilometers, is Mary's house from her sister's?\r<BR>\n" );
document.write( "\n" );
document.write( "What I've managed to reason:<BR>\n" );
document.write( "41 hours total-20 hours visiting=21 hours traveling<BR>\n" );
document.write( "From there, I'm clueless. I've no idea how to start building the equation for this. Help, please? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #399294 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=399294\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Mary travels from the city to visit her sister in the country. On the way, she travels 55km/hr. She stays with her sister for 20 hours before starting home. On the return trip, she travels 45 km/hr. She returned home a grand total of 41 hours after she left. How far away, in kilometers, is Mary's house from her sister's?\r<BR>\n" );
document.write( "\n" );
document.write( "What I've managed to reason:<BR>\n" );
document.write( "41 hours total-20 hours visiting=21 hours traveling<BR>\n" );
document.write( "------------<BR>\n" );
document.write( "The avg speed of a round trip = 2*55*45/(55+45) km/hr<BR>\n" );
document.write( "= 49.5 km/hr<BR>\n" );
document.write( "rt distance = r*t = 49.5*21 km<BR>\n" );
document.write( "Each way = 49.5*21/2 = 519.75 km<BR>\n" );
document.write( "============<BR>\n" );
document.write( "The avg speed of a round trip = 2*55*45/(55+45) km/hr<BR>\n" );
document.write( "You can trust me on that, or I can prove it. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );