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A tank can be filled by two pipes in 20 minutes and 30
minutes respectively. When the tank was empty the two
pipes were opened. After some time, the first pipe was
stopped and the tank was filled in 18 minutes. After how
much time of the start was the first pipe stopped
(a) 5 minutes
(b) 8 minutes
(c) 10 minutes
(d) 12 minutes

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 ?
(a) (x-y) Hours
(b) (y-x) Hours
(c) xy/(x-y) Hours
(d) xy/ (y-x) Hours

12 pumps working 6 hours a day can empty a completely
filled reservoir in 15 days. How many such pumps
working 9 hours a day will empty the same reservoir in
12 days?
(a) 15
(b) 9
(c) 10
(d) 12

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?
(a) 36 hrs
(b) 24 hrs
(c) 30 hrs
(d) 18 hrs

A tank can be filled with water by two pipes, A and B
together in 36 minutes. If the pipe B was stopped after
30 minutes, the tank is filled in 40 minutes. The pipe B
can alone fill the tank in
(a) 45 minutes
(b) 60 minutes
(c) 75 minutes
(d) 90 minutes

Two pipes A and B can fill a water tank in 20 and 24
minutes respectively and a third pipe C can empty at the
rate of 3 gallons per minute. If A, B and C are opened
together to fill the tank in 15 minutes, find the capacity
of tank?
(a) 180
(b) 150
(c) 120
(d) 60

Three pipes P, Q and R can separately -fill a cistern in 4, 8
and 12 hours respectively, Another pipe S can empty the
completely filled cistern in 10 hours. Which of the
following arrangements will fill the empty cistern in less
time than others?
(a) Q alone is open
(b) P, R and S are open
(c) P and S are open
(d) P, Q and S are open

A tank has a leak which would empty the completely
filled tank in 10 hours. If the tank is full of water and a
tap is opened which admits 4 litres of water per minute
in the tank, the leak takes 15 hours to empty the tank.
How many liters of water does the tank hold ?
(a) 2400 L
(b) 4500 L
(c) 1200 L
(d) 7200 L

An empty tank can be filled by pipe A in 4 hours and by
pipe B in 6 hours. If the two pipes are opened for 1 hour
each alternately with first opening pipe A, then the tank
will be filled in
(a) 1 3/4hours
(b) 2 3/5hours
(c) 4 2/3 hours
(d) 5 1/2 hours

A boy and girl together fill a cistern with water. The boy
pours 4 liters of water every 3 minutes and the girl pours
3 liters of water every 4 minutes. How much time will it
take fill 100 litres of water in the cistern
(a) 36 minutes
(b) 42 minutes
(c)48 minutes
(d) 44 minutes

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