**911. A completes 80% of a work in 20 days. Then B also joins and A and B together finish the remaining work in 3 days. How long does it need for B if he alone completes the work??****A. 37 Â½ days**

B. Â 22 days

C. Â 31 days

D. Â 22 days

**912. Kamal will complete work in 20 days. If Suresh is 25% more efficient than Kamal, he can complete the work in________days.?**

A. 14**B. Â 16**

C. Â 15

D. Â 11

**913. 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. Â 9

C. Â 11

D. Â 12

**914. Jameel can complete a task in 15 hours and Nasir can complete the same task in 12 hours. Jameel starts the task at 9:00 am and stops working at 2:00pm. Nasir starts working on the task at 4:00 pm. At what time is the task completed??**

A. 12:00 pm

B. Â 2:00 am**C. Â 12:00 am**

D. Â 10:00 pm

**915. Farjan and Kashif can complete a task in 30 days. Farjan leaves after 20 days and Kashif alone completes it in another 25 days. How many days does Farjan alone take to complete the entire task??****A. 50**

B. Â 75

C. Â 60

D. Â 45

**916. A and B can together do a piece of work in 15 days. B alone can do it in 20 days. In how many days can A alone do it ??**

A. 40 days

B. Â 50 days**C. Â 60 days**

D. Â 70 days

**917. Two pipes P and Q can fill a cistern in 12 min. and 15 min. respectively but a third pipe â€˜Râ€™ can empty the full tank in 6 min. Â P and Q are kept open for 5 min. in the beginning and then â€˜Râ€™ is also opened. Â In what time is the cistern emptied ??**

A. 30 min

B. Â 35 min

C. Â 40 min**D. Â 45 min**

**918. 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. Â 7/15

C. Â 11/15

D. Â 2/11

**919. Machine P can print one lakh books in 8 hours. Machine Q can print the same number of books in 10 hours while machine R can print the same in 12 hours. All the machines started printing at 9 A.M. Machine P is stopped at 11 A.M. and the remaining two machines complete work. Approximately at what time will the printing of one lakh books be completed??**

A. 3 pm

B. Â 2 pm**C. Â 1:00 pm**

D. Â 11 am

**920. A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20 days. A alone can do the work in__________??**

A. 20 days**B. Â 30 days**

C. Â 40 days

D. Â none of these