Time and Work Questions

A and B together can do a piece of work in 9 days. If A does thrice the work of B in a given time, the time A alone will take to finish the work is

P and Q can do a project in 6 and 12 days respectively. In how many days can they complete 25% of the project if they work together?

A labourer can do a job in 50 hours. After 5 hours he takes a break. What fraction of the job is yet to be done?

S, T and U together can complete a work in 30 days. If the ratio of efficiency of S, T and U is 20 : 15 : 12 respectively, then in how many days U alone can complete the same work?

Prabhat has done 1/2 of a job in 12 days. Santosh completes the rest of the job in 6 days. In how many days can they together do the job?

P and Q can do a project in 150 and 100 days respectively. In how many days can they complete 60% of the project if they work together?

A can do a certain job in 12 days. B is 60% more efficient than A. Then B can do the same piece of work in

50 men can complete a work in 28 days. They started the work together, but at the end of each 10th day, 10 men left the job. The work was completed in how many days?