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 ½ 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 ‘R’ can empty the full tank in 6 min.  P and Q are kept open for 5 min. in the beginning and then ‘R’ is also opened.  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