Mathematics mcqs

two pipes p and q can fill a cistern in 12 minutes and 16 minutes respectively.  simultaneously both the pipes are opened together, then after how much time q should be closed so that the tank is full in 9 min ?

two pipes p and q can fill a cistern in 12 minutes and 16 minutes respectively.

4 min

2 min

3 min

5 min

two pipes p and q can fill a cistern in 12 min. and 15 min. respectively but a third pipe ‘r’ can empty the full tank in 6 min.  p and q are kept open for 5 min. in the beginning and then ‘r’ is also opened.  in what time is the cistern emptied ?

two pipes p and q can fill a cistern in 12 min. and 15 min. respectively but a third pipe ‘r’ can empty the full tank in 6 min.

45 min

35 min

40 min

30 min

two pipes p and q can fill a cistern in 12 and 15 minutes respectively. both are opened together, but at the end of 3 minutes the first is turned off. how much longer will the cistern take to fill?

two pipes p and q can fill a cistern in 12 and 15 minutes respectively. both are opened together, but at the end of 3 minutes the first is turned off.

9 1/4 min

7 1/4 min

8 1/2 min

11 1/4 min

two pipes function simultaneously the reservoir will be filled in 12 hours. one pipe fills reservoir 10 hours faster than the other. how many hours does the faster pipe take to fill the reservoir?

two pipes function simultaneously the reservoir will be filled in 12 hours. one pipe fills reservoir 10 hours faster than the other.

20 hrs

28 hrs

35 hrs

25 hrs

two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minutall the three pipes working together can fill the tank in 15 minutes. the capacity of the tank is?

two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minutall the three pipes working together can fill

60 gallons

120 gallons

100 gallons

180 gallons

two pipes can fill a tank in 18 minutes and 15 minutes. an outlet pipe can empty the tank in 45 minutes. if all the pipes are opened when the tank is empty, then how many minutes will it take to fill the tank?

two pipes can fill a tank in 18 minutes and 15 minutes. an outlet pipe can empty the tank in 45 minutes.

11

10

12

13

two pipes can fill a tank in 10 hrs. and 12 hrs. respectively while a third pipe empties the full tank in 20 hrs.  if all the three pipes operate together , in how much time the tank will be filled ? 

two pipes can fill a tank in 10 hrs. and 12 hrs. respectively while a third pipe empties the full tank in 20 hrs.

5 hrs

7.5 hrs

none of these

7 hrs

two pipes a and b together can fill a cistern in 4 hours. had they been opened separately, then b would have taken 6 hours more than a to fill cistern. how much time will be taken by a to fill the cistern separately?

two pipes a and b together can fill a cistern in 4 hours. had they been opened separately, then b would have taken 6 hours more than a to fill cistern.

2 hrs

8 hrs

6 hrs

1 hr

two pipes a and b can separately fill a tank in 2 minutes and 15 minutes respectively. both the pipes are opened together but 4 minutes after the start the pipe a is turned off. how much time will it take to fill the tank?

two pipes a and b can separately fill a tank in 2 minutes and 15 minutes respectively.

10 min

12 min

11 min

9 min

two pipes a and b can separately fill a tank in 12 and 15 minutes respectively. a third pipe c can drain off 45 liters of water per minutif all the pipes are opened, the tank can be filled in 15 minutes. what is the capacity of the tank?

two pipes a and b can separately fill a tank in 12 and 15 minutes respectively.

480 liters

600 liters

675 liters

540 liters

two pipes a and b can fill a tank in 15 min and 20 min respectively. both the pipes are opened together but after 4 min, pipe a is turned off. what is the total time required to fill the tank?

two pipes a and b can fill a tank in 15 min and 20 min respectively. both the pipes are opened together but after 4 min, pipe a is turned off.

14 min 40 sec

11 min 45 sec

12 min 30 sec

10 min 20 sec

two pipes a and b can fill a cistern in 37 1/2 minutes and 45 minutes respectively. both pipes are opened. the cistern will be filled in just half an hour, if the pipe b is turned off after?

two pipes a and b can fill a cistern in 37 1/2 minutes and 45 minutes respectively. both pipes are opened.

9 min

5 min

15 min

10 min

two pipes a and b can fill a cistern in 20 and 30 minutes respectively, and a third pipe c can empty it in 40 minutes. how long will it take to fill the cistern if all the three are opened at the same time?

two pipes a and b can fill a cistern in 20 and 30 minutes respectively, and a third pipe c can empty it in 40 minutes.

15 1/7 min

7 1/7 min

19 1/7 min

17 1/7 min

two pipes a and b can fill a cistern in 12 and 15 minutes respectively. both are opened together but after 3 minutes a is turned off. after how much more time will the cistern be filled?

two pipes a and b can fill a cistern in 12 and 15 minutes respectively. both are opened together but after 3 minutes a is turned off.

3 1/4 min

9 1/4 min

5 1/4 min

8 1/4 min

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