Time, Work, and Projects

A and B can do a piece of work in 5 hours. B and C together can do it in 4 hours, while A and C together can do it in 3 hours. How long will B alone take to do it?

P and Q can complete a work in 15 days and 10 days, respectively. P alone started the work and Q joined him after 3 days till the completion of the work. How long did the work last?

A alone can do a piece of work in 5 days and B alone in 7 days. A and B have to do it for Rs. 3500, but they want to finish this work as soon as possible. They finish this work with the help of C in 2 days. How much money is to be paid to C?

If P can produce 42 packets of bread in 8 hours and Q can produce 35 packets in 7 hours, then how many hours are required to produce 123 packets of bread together?

A is thrice as good a workman as B and together they finish a piece of work in 21 days. In how many days will B alone finish the work?

A can do a job in 30 days and B can do the same job in 25 days. If they work together for 5 days on this job, what fraction of the job is completed?

It takes 7 men 12 days to complete a job. They worked for 5 days. After 5 days, 2 men left the job. In how many days will 5 men complete the job?

A is 3/4 times as good a workman as B and therefore, he is able to finish a job in 45 days less than B. if they work together, then how many days will they take to finish the work?

P can do a work in 6 hours. Q can do the same work in 8 hours, while R can do the same work in 10 hours. If they work together, then in how many hours will they finish the work?

A, B and C can do a job in 20, 25 and 50 days, respectively. In how many days can A do the work if B and C help him on every 4^th day?

5 skilled workers can build a wall in 20 days, 8 semi-skilled workers can build a wall in 25 days, 10 unskilled workers can build a wall in 30 days. If a team has 2 skilled, 6 semi-skilled and 5 unskilled workers, how long will it take to build the wall?