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01.  A and B can do a job together in 7 days. A is 1 3/4 times as efficient as B. The same job can be done by A alone in :  

02.  Twenty women can do a work in sixteen days. Sixteen men can complete the same work in fifteen days. What is the ratio between the capacity of a man and a woman?  

03.  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?  

04.  P can complete a work in 12 days working 8 hours a day. Q can complete the same work in 8 days working 10 hours a day. If both P and Q work together, working 8 hours a day, in how many days can they complete the work?  

05.  If 6 men and 8 boys can do a piece of work in 10 days while 26 men and 48 boys can do the same in 2 days, the time taken by 15 men and 20 boys in doing the same type of work will be:  

06.  If X and Y complete a certain work in 10 days, Y and Z in 16 days and X and Z in 22 days, find the time required for each one to complete the work while working separately.  

07.  If 6 men working together can complete 50 identical tasks in 4 hours then how many such identical tasks can be completed if 10 men are working together for 6 hours?  

08.  A cistern can be filled by two pipes A and B in 30 and 36 minutes respectively. When the cistern is empty, both the pipes are opened for a certain time, but being partially clogged, only 5/6 of the full quantity of water flows through the pipe A and only 9/10 through the pipe B. the obstructions, however, being suddenly removed, the cistern is filled in 15 1/12 minutes from that moment. How long was it before the full flow of water began?  

09.  Two taps A and B can separately fill a cistern in 10 and 12 min respectively. If the emptying tap C is open, then the two filling taps can together fill the cistern in 15 minutes. When the cistern is full, how long will it take for the tap C alone to empty the cistern?  

10.  A can do a piece of work in 45 days. He works at it for 5 days and then B completes it in 20 days. How long will A and B together take to complete the work?  
