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Aptitude preparation

Aptitude on Pipes and Cisterns

Aptitude questions and answers on Pipes and Cisterns

1.

A tap fill a pot in two hours because of a hole to the pot, it took 2 1/3 hours. Calculate the time needed for hole to emptied the pot completely?

A.

14

B.

12

C.

17

D.

19

2.

Pipe X can fill a tank in 50 hours, Pipe Y in 100 hours and pipe Z in 300 hours. If all the pipes are open, In how much time all 3 pipes fill the tank?

A.

23

B.

30

C.

19

D.

26

3.

13.5 litres capacity 12 Pots of water can be sufficient to fill a drum. How many 9 litres pots of water will be required to fill the above drum?

A.

23

B.

30

C.

19

D.

18

4.

PipeA  fill a tank 3times faster than PipeB. If two pipes can fill the tank in 36 minutes, then find the time needed for PipeB alone to fill the tank?

A.

144 minutes

B.

139 minutes

C.

114 minutes

D.

152 minutes

5.

Two taps A and B can separately fill a tank in 60 minutes and 75 minutes respectively. Tap C will be used to empty the tank. If all the 3 taps are opened at a time, then the tank is full in 50 minutes. In how much time, PipeC alone can empty the tank?

A.

140 minutes

B.

130 minutes

C.

110 minutes

D.

100 minutes

6.

Two pipes A and B can fill a barrel in 40 and 60 minutes respectively. Find the time to fill the Barrel if both the pipes are used?

A.

14 minutes

B.

13 minutes

C.

11 minutes

D.

24 minutes

7.

Pipe A can fill a tank in 5 hours and Pipe B can fill a tank in 6 hours. Pipe C can empty the tank  in 12 hours. If all the three pipes are opened in the same time, then the tank will be filled in?

A.

3 9/17 hours

B.

4 9/17 hours

C.

2 9/17 hours

D.

9/17 hours

8.

A Barrel can be filled by pipeA in 8 hours while pipeB can be empty the Barrel in 17 hours. If both the pipes start work at the same time, then find the time needed to fill the Barrel?

A.

5.11 hours

B.

15.11 hours

C.

25.11 hours

D.

None 

9.

PipeA, PipeB and PipeC can fill a Cistern in 5 hours. The pipe C is twice as fast as pipe B and pipe B is twice as fast as pipe A. How much time will pipe A alone will take to fill the Cistern?

A.

5 hours

B.

15 hours

C.

25 hours

D.

35 hours

10.

A tap can fill a tank in 16 hours. After half the tank is filled, 3 more same capacity  taps are opened. How much time needed to fill the tank?

A.

2 hrs 15 min

B.

5 hrs 15 min

C.

8 hrs 15 min

D.

None

11.

3 taps A, B and C can fill a tank from empty to full in 40 hours, 30 hours and 20 hours respectively. When the tank is empty, all the three taps are opened. A , B and C waste solutions x,y and z respectively. What is the proportion of waste solution z in the liquid in the tank after 3 minutes?

A.

6/1

B.

3/12

C.

6/13

D.

4/12

12.

Mug P has 3times more capacity than Mug Q. It takes 60 turns for Mug  P to fill the empty Drum. How many turns it will take for both the Mugs P and Q, having each turn together to fill the empty drum?

A.

21

B.

45

C.

36

D.

29

13.

A large tanker can be filled by two pipes A and B in 60 and 40 minutes respectively. How much time needed to fill the tanker from empty state if pipe B is used for half the time and pipe A and pipe B fill it together for the remaining half?

A.

30 min

B.

60 min

C.

10 min

D.

None

14.

The booster pump emptying capacity of the tank is 10 litres per minute higher than its filling capacity and the booster pump needs 8 minutes lesser to empty the tank than it needs to fill it. If the capacity of the tank is 2400 litres, find the filling capacity of the pump?

A.

40

B.

60

C.

50

D.

10