Pipes and Cistern

1.		Two pipes, A and B, can fill a tank in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tank from empty state if pipe B is used for half the time and pipe A and pipe B fill it together for the other half ?

20 min

25 min

27 min

30 min

2.		Two pipes can fill a tank in 20 minutes and 24 minutes respectively and a waste pipe can empty 3 litres per minute. All he three pipes working together can fill the tank in 15 minutes. The capacity of the tank is:

80 litres

100 litres

120 litres

180 litres

3.		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

4.		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

5.		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

6.		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

7.		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

8.		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

9.		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

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