operations on numbers (6.papers)

hcf and lcm (5.papers)

averages (8.papers)

problems on ages (9.papers)

percentage (4.papers)

profit and loss (4.papers)

ratio and proportion (5.papers)

chain rule (5.papers)

time and work (4.papers)

pipes and cisterns (5.papers)

time and distance (5.papers)

problems on trains (8.papers)

boats and streams (7.papers)

partnership (6.papers)

simple interest (4.papers)

compound interest (2.papers)

permutation and combination (3.papers)

clock (2.papers)

calendar (3.papers)

1

Two pipes P and Q can fill a tank in 22.5 hours and 18 hours respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank ?

10 hours

15 hours

16 hours

20 hours

Show Answer

2

If two pipes function simultaneously, the reservoir will be filled in 6 hours. One pipe fills the reservoir 5 hours faster than the other. How many hours does it take the second pipe to fill the reservoir ?

10 hours

15 hours

14 hours

15 hours

Show Answer

3

Two pipes fill in a tank in 10 min. and 15 min. respectively. If both pipes are opened how much time does it take to fill the tank ?

6 min

8 min

10 min

12 min

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4

One tap can fill a tank 10 hours. And another tap can empty the tank in 15 hours. How much time does it take to fill the tank if both pipes are opened ?

20 hours

25 hours

30 hours

35 hours

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5

An electric pump can fill a tank in 6 hours. Because of a leak in the tank, it took 7 hours to fill the tank. If the tank is full, how much time will the leak take to empty it ?

21 hours

35 hours

28 hours

42 hours

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6

Two pipes can fill a cistern in 8 hours and 7 hours respectively. The pipes are opened simultaneously and it is found that due to leakage in the bottom it took 16 minutes more to fill the cistern. When the cistern is full, in what time the leak empty it ?

28 hours

56 hours

72 hours

84 hours

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7

Two taps fill in tank in 20 hours. and 10 hours. Two taps are opened first. After how much time the second tap should be closed off so that the tap full in 14 hours ?

2 hours

3 hours

3 hours

4 hours

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8

Two pipes P and Q can fill a tank in 45 min. and 36 min. respectively. A water pipe can empty the tank in 30 min. First P and Q are opened. After 7 minutes, R is also opened. In how much time, the tank in full ?

46 min.

52 min.

56 min.

60 min.

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9

Two pipes P and Q can fill a tank in 12 min. and 16 min. respectively. If both the pipes are opened simultaneously, after how much time Q should be closed so that the tank is full in 6 minutes ?

4 min.

5 min.

6 min.

8 min.

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10

A tap fill a tank in 12 min. at the rate of 6 litre/min. another tap empties the tank in 36 min. How much remains in the tank after 10 min. ?

20 litres

30 litres

40 litres

50 litres

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11

Two pipes A and B can fill a tank in 40 min. and 60 min. respectively. If both the pipes are used together, then how long will take to fill the tank ?

16 min.

24 min.

36 min.

48 min.

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12

A tap can fill a tank in 9 hours. After half the tank is filled, two more similar taps are opened. What is the total time taken to fill the tank completely ?

6 hours

7 hours

8 hours

12 hours

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13

A tank is already 1/4 full. Two taps fill the tank in 10 hours and 15 hours respectively. Another tap can empty in 5 hours. If three pipes are opened, how much time does it take to empty the tank ?

16 hours

20 hours

28.6 hours

22.5 hours

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14

Pipes P and Q can fill a tank in 3 hours and 10 hours respectively. Pipe R can empty it in 15 hours. If all the three pipes are opened together, then the tank will be filled in :

7/2 hours

8/5 hours

30/11 hours

4 hours

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16

Two pipes A and B can separately fill a cistern in 150 minutes and 120 minutes respectively. There is a third pipe in the bottom of the cistern to empty it. If all the three pipes are simultaneously opened, then the cistern is full in 100 minutes. In how much time, the third pipe alone can empty the cistern ?

200 minutes

250 minutes

220 minutes

150 minutes

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17

A pump can fill a tank with water in 4 hours. Because of a leak, it took 5 hours to fill the tank. The leak can drain all the water of the tank in :

10 hours

12 hours

16 hours

20 hours

Show Answer

18

Two pipes A and B together can fill a tank in 8 hours. Had they been opened separately, then B would have taken 12 hours more than A to fill the tank. How much time will be taken by A to fill the tank separately.

8 hrs

10 hrs

12 hrs

16 hrs

Show Answer

19

One pipe can fill a tank four times as fast as another pipe. If together the two pipes can fill the tank in 24 minutes, then find out the time taken by the faster pipe to fill the tank?

20 min.

30 min.

40 min.

35 min.

Show Answer

20

A cistern is filled in 3 hours by three pipes A, B and C. the pipe C is twice as fast as B and B is thrice as fast as A. How much time will pipe A alone take to fill the tank ?

30 hours

35 hours

24 hours

28 hours

Show Answer