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1 . 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?
 A. 9 days B. 11 days C. 13 days D. 15 days

2 . A and B can do a work in 8 days, B and C can do the same work in 12 days. A, B and C together can finish it in 6 days. A and C together will do it in
 A. 8 days B. 13 days C. 9 days D. 12 days

3 . 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 differ
 A. 7 hours 15 minutes B. 8 hours 15 minutes C. 7 hours 30 minutes D. 8 hours 30 minutes

4 . A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in
 A. 4 days B. 8 days C. 6 days D. 12 days

5 . 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. 20 days B. 14 days C. 10 days D. 6 days

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