1. If A and B work together, they will complete a job in 7.5 days. However, if A works alone and completes half the job and then B takes over and completes the remaining half alone, they will be able to complete the job in 20 days. How long will B alone take to do the job if A is more efficient than B?

(1) 20 days      (2) 40 days      (3) 30 days      (4) 24 days
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2. Four men and three women can do a job in 6 days. When five men and six women work on the same job, the work gets completed in 4 days. How long will a woman take to do the job, if she works alone on it?

(1) 18 days      (2) 36 days      (3) 54 days      (4) None of these
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3. Shyam can do a job in 20 days, Ram in 30 days and Singhal in 60 days. If Shyam is helped by Ram and Singhal every 3rd day, how long will it take for them to complete the job?

(1) 12 days      (2) 16 days       (3) 15 days      (4) 10 days
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4. Two workers A and B manufactured a batch of identical parts. A worked for 2 hours and B worked for 5 hours and they did half the job. Then they worked together for another 3 hours and they had to do (1/20)th of the job. How much time does B take to complete the job, if he worked alone?

(1) 24 hours     (2) 12 hours     (3) 15 hours     (4) 30 hours
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5. A and B working together can finish a job in T days. If A works alone and completes the job, he will take T + 5 days. If B works alone and completes the same job, he will take T + 45 days. What is T?

(1) 25     (2) 60     (3) 15     (4) None of these
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6. A man can do a piece of work in 60 hours. If he takes his son with him and both work together then the work is finished in 40 hours. How long will the son take to do the same job, if he worked alone on the job?

(1) 20 hours    (2) 120 hours    (3) 24 hours    (4) None of these
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7. A, B and C can do a work in 5 days, 10 days and 15 days respectively. They started together to do the work but after 2 days A and B left. C did the remaining work (in days)

(1) 1         (2) 3        (3) 5         (4) 4
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8. X alone can do a piece of work in 15 days and Y alone can do it in 10 days. X and Y undertook to do it for Rs. 720. With the help of Z they finished it in 5 days. How much is paid to Z?

(1) Rs. 360     (2) Rs. 120    (3) Rs. 240      (4) Rs. 300
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9. Ram starts working on a job and works on it for 12 days and completes 40% of the work. To help him complete the work, he employs Ravi and together they work for another 12 days and the work gets completed. How much more efficient is Ram than Ravi?

(1) 50%         (2) 200%        (3) 60%          (4) 100%
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10. A red light flashes 3 times per minute and a green light flashes 5 times in two minutes at regular intervals. If both lights start flashing at the same time, how many times do they flash together in each hour?

(1) 30     (2) 24    (3) 20     (4) 60
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Answers :
1.  (3)
2.  (3)
3.  (3)
4.  (3)
5.  (3)
6.  (2)
7.  (4)
8.  (2)
9.  (4)
10. (1)