A and B together can complete a work in 12 days. A alone can complete it in 20 days. If B does the work only for half a day daily, then in how many days A and B together will complete the work?

Mohan can dig a well in 15 days, Shyam is 25% better than Mohan. How many days does Shyam alone can take to dig the same well?

The construction work is assign to the Group-I of 7 workers. They complete the task in 12 days. The another Group-II started the same task with same number of workers. They started the work and just after 5th day their 2 workers left the work. Now, in how many days this Group will complete the task ?

A and B together can complete a piece of work in 12 days. A alone can complete the work in 15 days. In how many days can B alone complete the same work?

X, Y and Z together can do a piece of work in 16 (4/11) days. X and Y together can do the same work in 20 days. In how many days will Z alone finish the 60% of the work?

A, B and C can complete a work in 7 days. If A and B complete the work together, they take 10 days. How much time will C take in completing the work alone ?

Rajan does $\frac{7}{11}$ of a work in 21 days. How many more days will he take to complete the work?