1). Two pipes A and B can fill a tank in 18 and 6 h, respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank?
A). \( \Large 4\frac{1}2{} \) h 
B). 7 h 
C). 6 h 
D). 10 h 

2). There are two tanks A and B to fill up a water tank. The tank can be filled in 40 min, if both taps are on. The same tank can be filled in 60 min, if tap A alone is on. How much time will tap alone take, to fill up the same tank?
A). 64 min 
B). 80 min 
C). 96 min 
D). 120 min 

3). A cistern can be filled up in 4 h by an inlet A. An outlet B can empty the cistern in 8 h. If both A and B are opened simultaneously, then after how much time the cistern get filled?
A). 5 h 
B). 7 h 
C). 8 h 
D). 6 h 

4). A pipe can fill a tank in 20 h. Due to a leak in the bottom, it is filled in 40 h. If the tank is full, how much time will the leak take to empty it?
A). 40 h 
B). 30 h 
C). 50 h 
D). 30 h 

5). A pipe can fill a tank in 10 h, while an another pipe can empty it in 6 h. Find the time taken to empty the tank, when both the pipes are opened up simultaneously.
A). 11 h 
B). 15 h 
C). 18 h 
D). 16 h 

6). Three taps are fitted in a cistern. The empty cistern is filled by the first and the second taps in 3 and 4 h, respectively. The full cistern is emptied by the third tap in 5 h. If all three taps are opened simultaneously, the empty cistern will be filled up in
A). \( \Large 1\frac{14}{23} \) 
B). \( \Large 2\frac{14}{23} \) 
C). 2 h 40 min 
D). 1 h 56 min 

7). Pipe A can fill a tank in 30 min, while pipe B can fill the same tank in 10 min and pipe C can empty the full tank in 40 min. If all the pipes are opened together, how much time will be needed to make the tank full?
A). \( \Large 9\frac{3}{13} \) h 
B). \( \Large 9\frac{4}{13} \) h 
C). \( \Large 9\frac{7}{13} \) h 
D). \( \Large 9\frac{9}{13} \) h 

8). Pipes A and B can fill a tank in 5 and 6 h, respectively. Pipe C can fill it in 30 h. If all the three pipes are opened together, then in how much time the tank will be filled up?
A). \( \Large 3\frac{3}{14} \) h 
B). \( \Large 2\frac{1}{2} \) h 
C). \( \Large 3\frac{9}{14} \) h 
D). \( \Large 2\frac{1}{14} \) h 

9). Through an inlet, a tank takes 8 h to get filled up. Due to a leak in the bottom, it takes 2 h more to get it filled completely. If the tank is full, how much time will the leak take to empty it?
A). 16 h 
B). 20 h 
C). 32 h 
D). 40 h 

10). A tap can fill an empty tank in 12 h and a leakage can empty the tank in 20 h. If tap and leakage both work together, then how long will it take to fill the tank?
A). 25 h 
B). 40 h 
C). 30 h 
D). 35 h 
