document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=899885>Question 899885</A>: <I><SPAN STYLE=\"word-break: break-all;\"> peter can crack the can in 30 minutes. renato can crack he can in 40 minutes. after working together for 20 minutes, badong helped them and finish the job in 2 minutes. if badong will do the entire job alone, for how long will it take him to finish the job? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #545640 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=545640\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The problem is peter and renato already finished the job in less than 18 minutes.\r<BR>\n" );
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document.write( "a=30<BR>\n" );
document.write( "b=40<BR>\n" );
document.write( "1/a+1/b=1/x<BR>\n" );
document.write( "1/30+1/40=1/x<BR>\n" );
document.write( "1/30+1/40=1/17.1428571<BR>\n" );
document.write( "1/x=1/17.1428571<BR>\n" );
document.write( "x=17.1428571 minutes working together<BR>\n" );
document.write( "check<BR>\n" );
document.write( "1/a+1/b=1/x<BR>\n" );
document.write( "1/30+1/40=1/x<BR>\n" );
document.write( "40/1200+30/1200=1/x<BR>\n" );
document.write( "70/1200=1/x<BR>\n" );
document.write( "1200/70=x<BR>\n" );
document.write( "x=17.1428571<BR>\n" );
document.write( "ok\r<BR>\n" );
document.write( "<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );