Time and Work

X and Y can do a job alone in 10 days and 12 days, respectively. X starts the work and after 5 days, Y also joins to finish the work together. For how many days did Y actually work on the job?

Pradeep and Dipali can do a piece of work in 10 days if they work together. Dipali alone can do it in 12 days. In how many days can Pradeep do the same work if he work alone?

If 10 men working 4 hours a day can do a piece of work in 6 days, in how many days can 20 men working 3 hours a day finish the same work?

A and B can do a piece of work in 4 days and 6 days respectively. What is the number of days required to complete the work when both work together?

Salim can do a piece of work in 20 days whereas his friend Akram can do it little faster & both of them finish it in 7.5 days. In how many days will Akram do it alone?

A certain work can be finished by 2 men & 3 boys in 5 days whereas 3 men & 2 boys can do it in 4 days. Compare the ratio of the work done by a man with that of a boy.

Anand finishes a work in 7 days, Bittu finishes the same job in 8 days and Chandu in 6 days. They take turns to finish the work. Anand on the first day, Bittu on the second and Chandu on the third day and then Anand again and so on. On which day will the work get over?

A piece of work, started with 5 working men, takes 20 days to be completed when one man is added per day. Find the same work will be finished in how many days if 12 men work regularly?

x and y, y and z and x and z do a work in 60, 45 and 30 hours, respectively. Then, in how many days can they complete the same work if they work simutaneously and start with x?

If x can do a work in 50 days, y can do the same work in 75 days and z can do it in 100 days. If all work simultaneously and y starts the work, then find out in how many days the work will be finished?

If x and y can do a piece of work in 12 day, y and z can do the same work in 15 days, and x and z can do that work in 20 days, then find the number of days required to finish the work if all (x y z) work simultaneously and the work starts with z.

Three technicians a, b and c have a work to make a server. a and b can make a server in 12 hours, b and c can destroy that server in 15 hour, and c and a can make the server in 20 hours. In how many days will the server be ready to work if a works alone?

A and B take a tender to do a work worth Rs. 504. If A can work alone for 15 days and B can alone do the same work in 20 days, then find out who gets extra amount and how much extra if both work together.

A, B and C take a tender to make a wall with Rs. 6072. If all work alone simultaneously, they complete the work in 15, 20 and 12 days, respectively. But, they work together to complete the wall. Find the highest amount accepted and the person who gets it.