SOLUTION: a can finish a job in 3 hour and b can finish the same ob in 6 hours. how long will it take both of them working together to finish the job?

Question 367053: a can finish a job in 3 hour and b can finish the same ob in 6 hours. how long will it take both of them working together to finish the job?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
A does in 3 hours
so A does 1/3 of the job in 1 hour
..
B does in 6 hours
B can do 1/6 of the job in 1 hour.
..
together they can dp 1/3 + 1/6 of the job in 1 hour
= 3/6
= 1/2 job in 1 hour
..
they will do the job in 2 hours
..
m.ananth@hotmail.ca
RELATED QUESTIONS
george can do a job in 6 hours and john can do the same job in 4 hours. how long will it... (answered by nerdybill)

21. If carol can finish a job in 5 hours and Steve can finish the same job in 10 hours,... (answered by josmiceli)

If carol can finish a job in 5 hours and Steve can finish the same job in 10 hours, how... (answered by richwmiller)

John can finish a job in 5 hours. Steve can finish the same job in 4 hours. After working (answered by richwmiller,Bastian21)

John can finish a job in 5 hours. Steve can finish the same job in 4 hours. After working (answered by richwmiller)

The first painter can finish a paint job in 3 hours. The second painter can finish the... (answered by edjones)

Roma can finish weeding a flower in 4 1/2 hour. Roma has worked for 2 hours before Amor... (answered by galactus)

Janet can do a job in 3 hours while Garry can do the same job in 2 hours. If Janet works... (answered by josgarithmetic,MathTherapy)

Janet can do a job in 3 hours while Garry can do the same job in 2 hours. If Janet works... (answered by richwmiller)