document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1101866>Question 1101866</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A man can do a job in 10 hours and his younger son can do it in 12 hours. After the father and his younger son have been working for 1 hour, the older son joins them, and the three completed the job in 3 more hours. How long will it take the older son to do the job?<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 #716489 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=716489\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "The other tutor's answer is right.<br><BR>\n" );
document.write( "Here is my solution, by a slightly different method that looks easier than what they did.<br><BR>\n" );
document.write( "As the other tutor showed in her calculations, the man and the younger son can do 11/60 of the job in 1 hour.<br><BR>\n" );
document.write( "When the older son joins them, the job is finished in another 3 hours.<br><BR>\n" );
document.write( "That means the man and his younger son work for 4 hours, and the older son works for 3.<br><BR>\n" );
document.write( "Since the man and the younger son do 11/60 of the job in 1 hour, they do 44/60 of the job in 4 hours.<br><BR>\n" );
document.write( "That means the older son does 16/60 of the job in 3 hours, which means 16/180 of the job in 1 hour.<br><BR>\n" );
document.write( "So the number of hours the older son alone would need to do the job alone is 180/16 = 11.25 hours. </SPAN>\n" );
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