Pipes and Cistern

1.		Two pipes A and B can fill a tank in 36 min and 45 min respectively. A pipe C can empty the full tank in 30 min. First A and B are opened and after 7 minutes, pipe C is also opened. In how much time, the tank will be full ?

46 min

48 min

50 min

52 min

2.		Two pipes A and B can fill a cistern in 12 minutes and 15 minutes respectively while a third pipe C can empty the filled tank in 6 minutes. Pipe A and pipe B are kept open for 5 minutes in the beginning and then pipe C is also opened. In what time the cistern will be emptied ?

30 min

33 1/3 min

40 min

45 min

3.		A water tank is two-fifth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely ?

6 min. to empty

6 min. to fill

9 min. to empty

9 min. to fill

4.		Two taps A and B can fill a tank in 5 hours and 20 hours respectively. If both the taps are open then due to a leakage it took 30 minutes more to fill the tank. In what time will the leakage alone empty the full tank ?

24 hrs

27 hrs

30 hrs

36 hrs

5.		A pipe A can fill a tank four times as fast as another pipe B. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone can fill the tank in:

180 min

160 min

144 min

136 min

6.		Two taps A and B can fill a tank separately in 10 minutes and 20 minutes respectively. However, a leakage at the bottom can empty a filled tank in 40 minutes. How much time will both the taps alongwith the leakage take to fill the empty tank ?

8 minutes

9 minutes

10 minutes

32 minutes

7.		Two pipes A and B can fill a cistern in 20 and 30 minutes respectively, and a third pipe C can empty it in 40 minutes. How long will it take to fill the cistern if all the three pipes are opened at the same time?

19 1/7 min

18 1/7 min

17 1/7 min

16 1/7 min

8.		Two pipes can fill a cistern in 14 hours and 16 hours respectively. The pipes are opened simultaneously and it is found that due to leakage in the bottom it took 32 minutes more to fill the cistern. In what time will the leakage empty the full cistern ?

106 hours

108 hours

110 hours

112 hours

9.		Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. The total time required to fill the tankis:

10 min 40 sec

12 min 40 sec

14 min 40 sec

16 min 40 sec

10.		A pipe can fill a tank three times as fast as the other pipe. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone can fill the tank in:

120 min

136 min

144 min

150 min