A can do piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ?

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1. A can complete a work in 12 days with a working of 8 hours per day. B can complete the same work in 8 days when working 10 hours a day. If A and B work together, working 8 hours a day, the work can be completed in_______days.

   A. 5 5⁄11
   B. 4 5⁄11
   C. 6 4⁄11
   D. 6 5⁄11

2. P and Q can do a work in 30 days. Q and R can do the same work in 24 days and R and P in 20 days. They started the work together, but Q and R left after 10 days. How many days more will P take to finish the work?

   A. 10
   B. 8
   C. 18
   D. 19

3. 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 ?

   A. 6 days
   B. 10 days
   C. 15 days
   D. 20 days

4. P is able to do a piece of work in 15 days and Q can do the same work in 20 days. If they can work together for 4 days, what is the fraction of work left?

   A. 8/15
   B. 7/15
   C. 11/15
   D. 2/11

5. A and B can do a piece of work in 21 and 24 days respectively.They start the work together and after some days, A leaves and B completes the rest of the task in 9 days. After how many days did A leave?

   A. 5
   B. 6
   C. 7
   D. 8

6. P can do a work in 24 days. Q can do the same work in 9 days and R can do the same in 12 days. Q and R start the work and leave after 3 days. P finishes the remaining work in_________days.

   A. 10
   B. 9
   C. 11
   D. 12

7. A and B can finish a work 30 days if they work together. They worked together for 20 days and then B left. A finished the remaining work in another 20 days. In how many days A alone can finish the work?

   A. 70
   B. 50
   C. 40
   D. 60

8. A and B working separately can do a piece of work in 9 and 12 days respectively. If they work for a day alternately. If A begins first, in how many days the work will be completed ?

   A. 42/4 days
   B. 41/4 days
   C. 55 days
   D. None of these

9. A,B,C, can do a work in 8,14,16 days respectively. A does the work for the first 2 days. B continues from it and finishes 2/3rd of the remaining work. C finishes the remaining work. How many days would have taken to complete the work?

   A. 13
   B. 11
   C. 12
   D. 15

10. Twelve children take sixteen days to complete a work which can be completed by 8 adults in 12 days. After working for 3 days, sixteen adults left and six adults and four children joined them. How many days will they take to complete the remaining work ?

    A. 3 days
    B. 4 days
    C. 6 days
    D. 8 days

    Submitted by: মোঃ আশাদুজ্জামান