document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=151277>Question 151277</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Mr Tan et off from Town A to Town B at an average speed of 75km/h at 08 00. Mr Chen set off from Town A after some time and overtook Mr Tan at 10 00. When Mr Chen reached Town B at 12 00, Mr Tan was still 30km away.<BR>\n" );
document.write( "(a)What was Mr Chen's average speed?<BR>\n" );
document.write( "(b)What time did Mr Chen leave Town A?\r<BR>\n" );
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document.write( "pls. try not to use algebra but if there is no choice, then, algebra would be fine. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #111170 by </B><A HREF=/tutors/aboutme.mpl?userid=vleith><B>vleith(2983)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=vleith><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=111170\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Not sure how one would solve this without using algebra:) But will try to get it simple.\r<BR>\n" );
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document.write( "Tan left at 8 going 75. Chen caught up to him at 10. So when Chen passes Tan, Tan has been driving for 2 hours. He has gone 75*2 = 150km.\r<BR>\n" );
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document.write( "Chen reaches B in another 2 hours. But Tan is still 30km from town. Tan has driven another 2 hours since being passed by Chen, so Tan has driven another 150km. And he is till 30km from B. So the total distance between A and B is 150+150+30 = 330km.\r<BR>\n" );
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document.write( "1) The distance from when Chen passed Tan to B is 150+30 = 180.<BR>\n" );
document.write( "Chen took 2 hours to cover 180km, so Chen's average speed is 180/2 = 90km.\r<BR>\n" );
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document.write( "2) The distance from A to where Chen catches Tan is 150km. Chen's average speed is 90. 150/90 = 5/3 hours. Chen left 20 minutes after Tan. So Chen left at 8:20\r<BR>\n" );
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