document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=427218>Question 427218</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Each of 2 brothers can wash a car in 1 hr.However their sister can wash the car in 45 mins., if all 3 works together how long will it take to wash the car?<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 #297089 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=297089\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Use minutes for all 3<BR>\n" );
document.write( "1 car in 60 mins --? 1/60 car/minute<BR>\n" );
document.write( "With all three, they do 1/60 + 1/60 + 1/45 car/min<BR>\n" );
document.write( "= (3+3+4)/180 car/min = 1/18 car per minute<BR>\n" );
document.write( "--> 18 minutes per car<BR>\n" );
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document.write( "You can use a shortcut<BR>\n" );
document.write( "The 2 brothers together take 30 minutes, since they both do 1/60 per minute<BR>\n" );
document.write( "Use 30 & 45 and the product/sum<BR>\n" );
document.write( "= (30*45)/(30 + 45) = 1350/75<BR>\n" );
document.write( "= 18 minutes<BR>\n" );
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