document.write( "Question 1159402: A man can do a job in 8 hours, a boy can do the same job in 12 hours and a girl can do it in 16 hours. How long will it take them to do the job if the man and the boy work together for one hour and then the boy and the girl finish the job? \n" ); document.write( "
Algebra.Com's Answer #782402 by mananth(16946)\"\" \"About 
You can put this solution on YOUR website!
A man can do a job in 8 hours, he does 1/8 of the job in 1 hour\r
\n" ); document.write( "\n" ); document.write( " a boy can do the same job in 12 hours, he does 1/12 of the job in 1 hour\r
\n" ); document.write( "\n" ); document.write( " and a girl can do it in 16 hours She he does 1/16 of the job in 1 hour\r
\n" ); document.write( "\n" ); document.write( " the man and the boy work together for one hour
\n" ); document.write( "So they do 1/8 +1/12 of the job = 5/24 of the job\r
\n" ); document.write( "\n" ); document.write( "Balance job = 1- (5/24 ) = 19/24 \r
\n" ); document.write( "\n" ); document.write( " and then the boy and the girl finish the job?\r
\n" ); document.write( "\n" ); document.write( "boy and girl together do (1/12 + 1/16) of the job in 1 hour = 7/48 \r
\n" ); document.write( "\n" ); document.write( "7/48 of job 1 hour
\n" ); document.write( "19/24 of the job in t hours = (19/24)/(7/48) = 5.4 hours\r
\n" ); document.write( "\n" ); document.write( "Total 5.4 + 1 = 6.4 hours\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );