type -1
1- Two pipes A and B can fill a tank in 20 minutes and 30 minutes respectively. If both pipes are open together , the time take to fill the tank is :
(1) 50 minutes (2) 25 minutes
(3) 12 minutes (4) 15 minutes
2- A tap can empty a tank in 1 hour. A second tap can empty it in 30 minutes. If both tapes operating simultaneously, how much time is needed to empty the tank ?
(1) 20 minutes (2) 30 minutes
(3) 40 minutes (4) 45 minutes
3- A cistern can be filled with water by a pip in 5 hour and it can be empty by a 2nd pipe in 4 hours. If both the pipes are opened when the cistern is full,the time in which it will be empty is:
(1) 9 hours (2) 18 hours
(3) 20 hours (4) 27 hours
4-Two pipes A and B can separately fill a cistern in 60 minutes
and 75 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 50 minutes. In how much time the
third pipe alone can empty the cistern?
(1) 110 minutes (2) 100 minutes
(3) 120 minutes (4) 90 minutes
5- A pipe can fill a tank in x hours and another pipe can empty
it in y (y>x) hours.if both the pipes are open, in how many hours
will the tank be filled ?
(1) (x-y) (2) (y-x)
(3) xy / (x-y) (4) xy / (y-x)
6-12 pumps working 6 hour a day can empty a completed filled
reservoir in 15 days. How many such pumps working 9 hours
a day will empty the same reservoir in 12 days ?
(1) 15 (2) 9
(3) 10 (4) 12
7-A tank can be filled by pipe A in 2 hours and pipe B in 6 hours.
At 10 am pipe A was opened. At what time will the tank be filled
if pipe B is opened at 11 am ?
(1) 12.45 am (2) 5 pm
(3) 11.45 pm (4)12 pm
8-A water tank can be filled by a tap in 30 minutes and
another tap can fill it in 60 minutes. If both the taps are kept
open for 5 minutes and then the first tap is close,how long
will it take for the tank to be full ?
(1) 20 minutes (2) 25 minutes
(3) 30 minutes (4) 45 minutes
9-Two pipes A and B can fill a tank in 36 minutes and 45 minutes
respectively. Another pipe C can empty the tank in 30 minutes.
First A and B are opened. After 7 minutes , C is also opened.
The tank is filled up in
(1) 39 minutes (2) 46 minutes
(3) 40 minutes (4) 45 minutes
10-Two pipes A and B can fill a tank in 2 hours and 3 hours
respectively. If both the pipes are opened simultaneously in
the empty tank, then the tank will be filled in
(1) 1 hour 12 mint (2) 2 hour 30 mint
(3) 1 hour 15 mint (4) 1 hour 20 mint
Ans-
1- 2 2- 1 3- 3 4- 2 5- 4 6- 3 7- 3 8- 4 9- 2 10- 1
Type- 2
1- If 1/3 of a tank holds 80 liters of water, then the quantity
of water that 1/2 tank hold is
(1) 240 liters (2) 120 liters
(3) 80/3 liters (4) 100 liters
2- A cistern has two pipes. One can fill it in 8 hours and other
can empty it in 5 hours. In how many hours will the cistern be
emptied if both the pipes are opened together when 3/4 of the
cistern is already full of water ?
(1) 40/3 hours (2) 10 hours
(3) 6 hours (4) 10/3 hours
3- 3/4 part of a tank is full of water. When 30 liter of water is taken
out then tank become empty. The capacity of the tank is
(1) 36 liters (2) 42 liters
(3) 40 liters (4) 38 liters
Type- 3
1- Three taps A, B and C can fill a tank in 12, 15 and 20 hours
respectively. If A is open all the time and B an C are opened for
one hour each alternatively, the tank will be full in
(1) 5 hours (2) 6 hours
(3) 7 hours (4) 8 hours
2-A pump can fill a tank with water in 2 hours. Because of a leak in
the tank it was taking 7/3 hours to fill the tank. The leak can drain
all the water off the tank in
(1) 11 hours (2) 12 hours
(3) 13 hours (4) 14 hours
3- A tap can fill a tank in 6 hours. After half the tank is filled, three
more similar tabs are opened. What is the total time taken to fill
the tank completely ?
(1) 4 hours (2) 4 hours 15 mint
(3) 3 hours 15 mint (4) 4 hours 45 mint
4- Two tanks A and B can fill a cistern in 75/2 minutes and 45 minutes
respectively. Both pipes are opened. The cistern will be filled just in
half hour, if the pipe B is turned off after
(1) 15 minutes (2) 15 minutes
(3) 5 minutes (4) 9 minutes
5- A tap takes 36 hours extra to fill a tank due to a leakage
equivalent to half of its inflow. The inflow can fill the tank in
how many hours ?
(1) 36 hours (2) 24 hours
(3) 30 hours (4) 18 hours
6- Three pipes A, B and C can fill a cistern in 6 hours. After working
at it together for 2 hours, C is closed and A and B fill it in 7 hours
more. The time taken by C alone to fill the cistern is
(1) 14 hours (2) 15 hours
(3) 16 hours (4) 17 hours
7- Pipe A can fill a cistern in 6 hours and pipe B can fill it in
8 hours. Both the pipes are opened simultaneously , but after
two hours pipe a is closed. How many hours will B take to fill
the remaining part of the cistern ?
(1) 2 hours (2) 10/3 hours
(3) 8/3 hours (4) 4 hours
8- Three pipes A , B and C can fill a tank in 6 hours. After working
together for two hours, C is closed and A and B fill the tank in 8 hours.
The time in which the tank can be filled by pipe C alone is
(1) 10 hours (2) 12 hours
(3) 8 hours (4) 9 hours
Ans-
1- 3 2- 4 3- 4 4- 4 5- 4 6- 1 7- 2 8- 2
Type- 4
1- A pipe can empty a tank three times as fast as another
pipe. If together the two pipes can fill the tank in 36 minutes,
the slower pipe alone will be able to fill the tank in
(1) 81 minutes (2) 108 minutes
(3) 144 minutes (4) 192 minutes
2- A pipe can empty a tank in 40 minutes. A second pipe
with diameter twice as much as that of the first is also
attached with the tank to empty it . The two together
Can empty the tank in
(1) 8 minutes (2) 9 minutes
(3) 10 minutes (4) 11 minutes
3- Two pipes can fill a tank with water in 15 and 12 hours
respectively and a third pipe can empty it in 4 hours.
If the pipes be opened in order at 8,9 and 11 am respectively,
the tank will be emptied at
(1) 11.40 am (2) 12.40 pm
(3) 1.40 pm (4) 2.40 pm
4- A swimming pool has 3 drain pipes. The first two pipe A and
B operating simultaneously, empty the pool in half the time that
C, the third pipe, alone take to empty it. Pipe A working alone
takes half the time taken by pipe B. Together they take
6 hours 40 minutes to empty the pool. Time taken by
pipe A to empty the pool, is
(1) 15 hours (2) 10 hours
(3) 30 hours (4) 7 hours
5- A tap drips at a rate of one drop/ sec . 600 drops
make 100 ml. The no of liters wasted in 300 days is
(1) 4320000 (2) 432000
(3) 43200 (4) 4320
6- Having the same capacity 9 taps fill up a water tank
in 20 minutes. How many taps of the same capacity are
required to fill up the same water tank in 15 minutes ?
(1) 10 (2) 12
(3) 15 (4) 18
Ans-
1- 3 2- 2 3- 1 4- 1 5- 4 6- 2
