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Here I am giving you qus paper for practice

Two pipes A and B can fill a cistern in 371⁄2 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if pipe B is turned off after:
A. 5 min

B. 9 min

C. 10 min

D. 15 min

A pump can fill a tank with water in 2 hours. Because of a leak, it took 22⁄3 hours to fill the tank. The leak can drain all the water of the tank in:
A. 6 hours

B. 8 hours

C. 9 hours

D. 10 hours

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. 30 hours

B. 15 hours

C. 10 hours

D. 6 hours

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 the cistern. How much time will be taken by A to fill the cistern separately?
A. 6 hours

B. 2 hours

C. 4 hours

D. 3 hours

Two pipes A and B can fill a tank in 12 and 24 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?
A. 9 min

B. 8 min

C. 6 min

D. 4 min

Two pipes A and B can fill a tank in 15 minutes and 40 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?
A. 10 min 10 sec

B. 25 min 20 sec

C. 29 min 20 sec

D. 20 min 10 sec

Two pipes can fill a tank in 25 and 30 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is:
A. 250 gallons

B. 450 gallons

C. 120 gallons

D. 150 gallons

A tank is filled in 10 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?
A. 70 hours

B. 30 hours

C. 35 hours

D. 50 hours

One pipe can fill a tank four 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. 180 min

B. 144 min.

C. 126 min

D. 114 min

A tap can fill a tank in 4 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?
A. 3 hr

B. 1 hr 30 min

C. 2 hr 30 min

D. 2 hr

A tap can fill a tank in 4 hours. After half the tank is filled, two more similar taps are opened. What is the total time taken to fill the tank completely?
A. 1 hr 20 min

B. 4 hr

C. 3 hr

D. 2 hr 40 min
Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is:
A. 10

B. 12

C. 14

D. 16

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

Pipe A can fill a tank in 8 hours, pipe B in 4 hours and pipe C in 24 hours. If all the pipes are open, in how many hours will the tank be filled?
A. 2.4 hr

B. 3 hr

C. 4 hr

D. 4.2 hr

Two pipes A and B can fill a tank is 8 minutes and 14 minutes respectively. If both the taps are opened simultaneously, and the tap A is closed after 3 minutes, then how much more time will it take to fill the tank by tap B?
A. 6 min 15 sec

B. 5 min 45 sec

C. 5 min 15 sec

D. 6 min 30 sec

A water tank is two-fifth full. Pipe A can fill a tank in 12 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?
A. 2.8 min

B. 4.2 min

C. 4.8 min

D. 5.6 min

Pipes A and B can fill a tank in 8 and 24 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:
A. 18 hr

B. 6 hr

C. 24 hr

D. 12 hr