11.
|
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 and C are open for one hour each alternately, the
tank will be full in:
|
A.
|
6 hours
|
B.
|
|
C.
|
7 hours
|
D.
|
|
|
12. A pipe A can fill the tank in 10 hrs, B can fill it in 20 hrs
and C can empty in 40 hrs. All are opened at the same time. After how many hours shall the pipe B be closed
such that the tank can be filled in 10 hrs?
A.15 Hrs B.5 Hrs
C.10 Hrs D.2Hrs
13. An electric pump can fill a tank in 3 hours. Because of a leak
in the tank, it took 3 hours 30 min to fill the tank. The leak can drain out all the water of the tank in
A.10 hours 30 min B.21
hours
C.12 hours D.24 hours
14. Two pipes can fill a tank in 10 hours and 12 hours
respectively while a third pipe empties the full tank in 20 hours. If all the
three pipes operate simultaneously, in how much time the tank will be filled?.
A.7hrs B.7 hrs 30 mm.
C.8hrs D.8 hrs. 30 mm.
15.
|
Two
pipes A and B can fill a cistern in 37 minutes
and 45 minutes respectively. Both pipes are opened. The cistern will be
filled in just half an hour, if the B is turned off after:
|
A.
|
5 min.
|
B.
|
9 min.
|
C.
|
10 min.
|
D.
|
15 min.
|
|
16. One tap can fill a cistern in 2 hours and another tap can
empty the cistern in 3 hours. How long will they take to fill the cistern if
both the taps are opened ?
A.5 his B.7 hrs
C.6 his D.8 his
17.
|
A
tank is filled by three pipes with uniform flow. The first two pipes
operating simultaneously fill the tank in the same time during which the tank
is filled by the third pipe alone. The second pipe fills the tank 5 hours
faster than the first pipe and 4 hours slower than the third pipe. The time
required by the first pipe is:
|
A.
|
6 hours
|
B.
|
10 hours
|
C.
|
15 hours
|
D.
|
30 hours
|
|
18. 12 buckets of water fill a
tank when the capacity of each bucket is 13.5 litres. How many buckets will be
needed to fill the same tank, if the capacity of each bucket is 9 litres? .
A.8 B.15
C.16 D.18
19.
|
A
large tanker can be filled by two pipes A and B in 60 minutes and 40 minutes
respectively. How many minutes will it take to fill the tanker from empty
state if B is used for half the time and A and B fill it together for the
other half?
|
A.
|
15 min
|
B.
|
20 min
|
C.
|
27.5 min
|
D.
|
30 min
|
|
20.
|
One
pipe can fill a tank three times as fast as another pipe. If together the two
pipes can fill the tank in 36 minutes, then the slower pipe alone will be
able to fill the tank in:
|
A.
|
81 min.
|
B.
|
108 min.
|
C.
|
144 min.
|
D.
|
192 min.
|
|
