A and B can do a piece of work in 15 days and 20 days respectively. If they work together, how long will it take to complete the work?

A can do a job in 12 days, B in 15 days, and C in 20 days. How long will they take to complete the job if they work together?

A can complete a work in 20 days and B in 30 days. If they work together, how long will it take them to complete the work?

A can do a job in 9 days, B in 12 days, and C in 18 days. How many days will it take for all three working together to complete the job?

A and B can complete a work in 40 days and 60 days respectively. If they work together for 12 days, how much of the work is completed?

If A and B together can complete a work in 10 days, and B alone can complete it in 15 days, how many days will A alone take to complete the work?

A, B, and C can complete a work in 8, 12, and 24 days respectively. How long will it take for all three to complete the work together?

A and B can finish a job in 16 days and 24 days respectively. If they start the work together and A leaves after 8 days, how many days will B take to complete the remaining work?

If A can complete a job in 4 hours and B can do the same job in 6 hours, how long will it take for both A and B to complete the job together?

If A can complete a job in 25 days, and B can complete the same job in 35 days, how long will it take them to complete the job if they work together?