Work and Time Problems

A and B completed a work together in 5 days. had A worked at twice the speed and B at half the speed, it would have taken them four days to complete the job. How much time would it take for A alone to do the work?

• 10 days

• 20 days

• 25 days

• 24 days

X takes 4 days to complete one-third of a job. Y takes 3 days to complete one-sixth of the job and Z takes 5 days to complete half the job. If all of them work together for 3 days and X and Z quit, how long will it take for Y to complete the remaining work done.

• 6 days

• 8.1 days

• 5.1 days

• 7 days

A and B can compete a piece of work in 18 days. They worked together for 12 days and then A left. B alone finished the work in 15 days. If Rs. 1500 be paid for the work then A's share is:

• Rs. 750

• Rs. 800

• Rs. 900

• Rs. 600

To complete a piece of work A and B take 8 days, B and C 12 days. A, B and C take 6 days. A and C will take :

• 7 Days

• 8 Days

• 7.5 Days

• 8.5 Days

A is thrice good a workman as B and therefore is able to finish a job in 40 days less than B. Working together they can do it in :

• 15 days

• 16 days

• 18 days

• 20 days

Two pipes can fill the cistern in 10hr and 12 hr respectively, while the third empty it in 20hr. If all pipes are opened simultaneously, then the cistern will be filled in:

• 8 hr

• 7.5 hr

• 8.5 hr

• 10 hr

A group of men decided to do a job in 4 days. But since 20 men dropped out every day, the job completed at the end of the 7th day. How many men were there at the beginning?

• 240

• 280

• 140

• 150

If 2 men or 3 women or 4 boys can do a piece of work in 52 days, then the same piece of work will be done by 1 man, 1 woman and 1 boy in:

• 48 days

• 36 days

• 45 days

• 50 days

If 3 men or 4 women can plough a field in 43 days, how long will 7 men and 5 women take to plough it?

• 10 days

• 11 days

• 9 days

• 12 days

Raj can do a piece of work in 20 days. He started the work and left after some days, when 25% work was done. After it Abhijit joined and completed it working for 10 days. In how many days Raj and Abhijit can do the complete work, working together?

• 8

• 6

• 10

• 12