SOLUTION: Dave,Joe,and Sabrina were assigned the job of cataloging the music for their school band.Dave could have completed the assignment in 2 hours alone,Joe in 3 hours, and Sabrina in 4

Question 904803: Dave,Joe,and Sabrina were assigned the job of cataloging the music for their school band.Dave could have completed the assignment in 2 hours alone,Joe in 3 hours, and Sabrina in 4 hours.They started work together, but Joe left at the end of a half-hour and Sabrina at the end of an hour. How long did Dave work alone to finish the cataloging?

Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
a=2 b=3 c=4
.5/2+1/3+z/4=1
1/4+1/3+z/4=1
7/12+z/4=1
z/4=5/12
z=20/12
z = 1.66667

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