Time and Work problems - Aptitude Questions and Answers

Time and Work problems :

1 . A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in:
  • 48/5
  • 34/5
  • 67/5
  • 56/5


2. A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :
  • 8/15
  • 9/15
  • 9/45
  • 8/45

3. A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?
  • 15 days
  • 56 days
  • 13 days
  • 10 days

4. A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:
  • 45/2
  • 4/5
  • 2/3
  • 1/2

5. A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs. 3200. With the help of C, they completed the work in 3 days. How much is to be paid to C?
  • Rs. 400
  • Rs. 800
  • Rs. 789
  • Rs. 700

6 . X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last?

  • 10 days
  • 8 days 
  • 6 days 
  • 19 days


7. A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days?
  • 13 days
  • 6 days
  • 26 days
  • 8 days

 
8. Ravi and Kumar are working on an assignment. Ravi takes 6 hours to type 32 pages on a computer, while Kumar takes 5 hours to type 40 pages. How much time will they take, working together on two different computers to type an assignment of 110 pages?


  • 8 hours 15 min
  • 7 hours 45 min
  • 6 hours 45 min
  • 9 hours 45 min

 
9. Sakshi can do a piece of work in 20 days. Tanya is 25% more efficient than Sakshi. The number of days taken by Tanya to do the same piece of work is:
  • 13
  • 16
  • 15
  • 20

10.  A, B and C can complete a piece of work in 24, 6 and 12 days respectively. Working together, they will complete the same work in:
  • 24/7
  • 5
  • 6
  • 5/8

































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