Pipes and Cistern

1.		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

2.		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

3.		Two pipes A and B can separately fill a cistern in 60 minutes and 75 minutes respectively. There is a third pipe in the bottom of the cistern to empty it. If all the three pipes are opened simultaneously then the cistern is filled in 50 minutes. The third pipe alone can empty the cistern in:

90 min

100 min

110 min

120 min

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.		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

6.		Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, the pipe B would have taker 6 hours more than pipe A to fill the cistern. pipe A can fill the cistern separately in:

1 hrs

2 hrs

6 hrs

4 hrs

7.		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

8.		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

9.		A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?

30 hours

32 hours

35 hours

40 hours

10.		A pump can fill a tank in 2 hours but due to a leak, it took 2 1/3 hours to fill the tank. The leak can empty the tank in:

13 1/3 hours

10 hours

12 hours

14 hours