Time and Work Questions

One tap can fill a water tank in 50 mins and another tap can make the filled tank empty in 75 mins. If both the taps are open together, already half filled tank would be full in

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?