Time Speed Dist...

A can do a piece of work in 7 days of 9 hr each, and B can do it in 6 days of 7 hr each. How long will they take to do it working together 42/5 hr a day?

A can do a piece of work in 80 days. He works for 10 days and then B alone finishes the remaining work in 42 days. The two together could complete the work in

A and B can do a piece of work in 45 and 40 days respectively. They begin together, but A leaves after some days and B completes the remaining work in 23 days. For how many days did A work?

A does half as much as work as B in three-fourths of the time. If together they take 18 days to complete the work, how much time will B take to do it?

A can do a certain job in 12 days. B is 60% more efficient than A. B can do the work alone in

A and B can do a job in 25 days and 20 days respectively. A started the work and was joined by B after 10 days. The number of days taken to complete the work is

A is twice as good as B, and they together finish a job in 14 days. A will finish the work alone in

A and B can do a piece of work in 72 days; B and C in 120 days; A and C in 90 days. In how many days can A do it alone?

A and B can do a job in 12 days, and B and C can do it in 16 days. After A has been working for 5 days and B for 7 days, C finishes the work in 13 days. In how many days can C do the work alone?

Twelve men can do a job in 8 days. Six days after they start, 4 men join them. How many more days will it take to do the job?