document.write( "Question 1022905: blueberry can do a certain job in 10 hours and cheescake can do it in 12 hours. after blueberry and cheesecake have been working together for 1 hour, Duhat joins them, and the three completed the job in 3 more hours. How long will it take duhat to do the job alone? \n" ); document.write( "

Algebra.Com's Answer #653460 by jorel555(1290) $\"\"$ $\"About$

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Let b=blueberry, c=cheesecake, and d=duhat. In one hour, blueberry does 1/10th of the job, and cheese cake does 1/12th of the job. So:
\n" ); document.write( "After 1 hour:
\n" ); document.write( "1/10+1/12=6/60+5/60=11/60th of the job done.
\n" ); document.write( "11/60+3/d+3/10+3/12=1
\n" ); document.write( "11d+180+18d+15d=60d
\n" ); document.write( "16d=180
\n" ); document.write( "d=11.25 hours for Duhat to do the job alone!!!!!!!!!!! \n" ); document.write( "

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