A can do piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ?
A. 70 days
B. 120/7 days
C. 50 days
D. 45 days
A can do a certain job in 12 days. B is 60% more efficient than A. The number of days it takes for B to do the same piece of work, is: ____?
A. 12/6 days
B. 15/2 days
C. 23 days
D. 34 days
Two pipes P and Q can fill a cistern in 12 minutes and 16 minutes respectively. Simultaneously both the pipes are opened together, then after how much time Q should be closed so that the tank is full in 9 min ?
A. 2 min
B. 3 min
C. 4 min
D. 5 min
P, Q and R can complete a work in 24, 6 and 12 days respectively. The work will be completed in ____ days if all of them are working together.
A. 2
B. 3 3⁄7
C. 4 ¼
D. 5
A work can be finished in 16 days by twenty women. The same work can be finished in fifteen days by sixteen men. The ratio between the capacity of a man and a woman is _____?
A. 1:3
B. 4:3
C. 2:3
D. 2:1
If 10 bulls can plough 20 identical fields in 3 days working 10 hours a day, then in how many days can 30 bulls plough 32 same identical fields working 8 hours a day?
A. 2
B. 8
C. 10
D. 12
A can lay a railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in ___?
A. 4
B. 9.6
C. 9
D. 10
Twelve men can do a work in twenty days while twenty women can finish the same work in sixteen days. Find the ratio between the capacity of a man and a woman.
A. 3:4
B. 5:4
C. 4:3
D. 5:3
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. 30 days
C. 40 days
D. none of these
A tap can fill a tank in 32 min. and another can empty it in 16 min. If the tank is already half full and both the tanks are opened together, the tank will be _____?
A. 12 min
B. 14 min
C. 16 min
D. 20 min