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)

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2

Two pipes A and B can fill in 40 minutes and 30 minutes respectively. Both the pipes are opened together but after 5 minutes, pipe B is turned off. What is the total time required to fill the tank ?

33 min. 20 sec.

35 min. 40 sec.

26 min. 32 sec.

38 min. 30 sec.

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3

A tanker can be filled by two pipes A and B in 20 minutes and 30 minutes respectively. How many minutes will it take to fill the tanker from empty state if A is used for half the time and A and B fill it together for the other half ?

10 minutes

15 minutes

20 minutes

25 minutes

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4

Three taps A, B and C can fill a tank in 24, 30 and 40 hours respectively. If A is open all the time and B and C are open for one hour each alternately, the tank will be full in :

8 hours

10 hours

14 hours

16 hours

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5

A pump can be used for filling as well as for emptying a tank. The capacity of the tank is 1200 m^3. the emptying capacity of the tank is 5 m^3 per minute higher than its filling capacity and the pump needs 8 minutes lesser to empty the tank than it needs to fill it. what is the filling capacity of the pump ?

15 m^3/min.

18 m^3/min.

20 m^3/min.

25 m^3/min.

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6

A leak in the bottom of a tank can empty the full tank in 4 hours. An inlet pipe fills water at the rate of 5 litres a minute. When the tank is full, the inlet is opened and due to the leak, the tank is empty in 6 hours. How many litres does the tank hold ?

3000 litres

3600 litres

4000 litres

4200 litres

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7

Two pipes can fill a tank in 12 min. 10 min respectively and a waste pipe can empty 15 litres per minute. All the three pipes working together can fill the tank in 30 min. the capacity of the tank is :

100 litres

120 litres

115 litres

125 litres

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8

Two pipes A and B can fill a tank in 90 minutes and 75 minutes respectively. Both pipes are opened. The tank will be filled in just 45 minutes, if the pipe A is turned off after :

24 min.

30 min.

36 min.

40 min.

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9

Three pipes A, B and C can fill a tank in 12 hours. After working at it together for 4 hours, C is closed and A and B can fill the remaining part in 14 hours. The number of hours taken by C alone to fill the tank is :

21 hours

28 hours

35 hours

none

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10

Two pipes can fill a tank in 8 and 12 hours respectively where as escape pipe can empty it in 6 hours. If the three pipes are opened at 3pm, 4 pm and 5 pm respectively at what time will the tank be filled ?

6 A.M.

6 P.M.

9 P.M

9 A.M.

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11

A tanker could be filled in 9 hours takes one hour more to be filled owing to a leak in its bottom. If the tanker is full in what time will the leak empty it ?

90 hours

100 hours

120 hours

80 hours

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12

Two pipes A and B can fill a cistern in 20 min. and 30 min. respectively, and a third pipe C can empty it in 36 min. How long will it take to fill the cistern if all the three are opened at the same time ?

15 min.

18 min.

21 min.

24 min.

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14

A tanker has two inlets which fill it in 12 min. and 15 min. respectively. There is also a outlet pipe and when all the three are opened, the empty tanker becomes full in 20 min. How long will the waste pipe take to empty the full tank ?

6 min.

10 min.

12 min.

15 min.

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15

A water tank can be filled by two pies P1 and P2 working simultaneously in 24 and 32 min. respectively. Both pipes being opened, find when the first pipe must be turned off so that the tanker may be just filled in 20 min.

after 8 min.

after 10 min.

after 7 min.

after 9 min.

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17

Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:

30/17

2 8/11

3 9/17

4 1/2

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