Pipes and Cistern

1.		Two pipes A and B can fill a tank in 12 minutes and 15 minutes respectively. If both the pipes are opened simultaneously, and the pipe A is closed after 3 minutes, then how much more time will it take to fill the tank by pipe B ?

7 min 15 sec

7 min 45 sec

8 min 15 sec

8 min 45 sec

2.		Two pipes A and B can fill a tank in 6 hours and 4 hours respectively . If they are opened on alternate hours and if pipe A is opened first in how many hours the tank will be filled ?

4

4.5

5

6

3.		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

4.		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

5.		Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are opened together, the tank will be filled in:

10 min

12 min

14 min

16 min

6.		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

7.		Two pipes A and B can fill a tank in 9 hours and 3 hours respectively. If they are opened on alternate hours and if pipe A is opened first, how many hours, the tank will be filled?

4 hr

5 hr

5.5 hr

6 hr

8.		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

9.		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

10.		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