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- Question
A water tank is filled in 5 hours by three pipes X, Y and Z the pipe Z is thrice as fast as Y and Y is twice as fast as X. How much time will pipe X alone take to fill the water tank?
Options- A. 60 hrs
- B. 45 hrs
- C. 40 hrs
- D. 35 hrs
- Correct Answer
- 45 hrs
- 1. 3 pipes when opened for 3 hours can fill 3 buckets. How many buckets can 2 pipes open for 2 hours approximately fill?
Options- A. 2/3 buckets
- B. 2 buckets
- C. 1 bucket
- D. 4/3 bucket Discuss
- 2. One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill tank in 36 min, then the slower pipe alone will be able to fill the tank in ?
Options- A. 85 min
- B. 92 min
- C. 187 min
- D. 144 min Discuss
- 3. In what time would a cistern be filled by three pipes which diameters are 2 cm, 3 cm and 4 cm running together, when the largest alone can fill it is 58 minutes? The amount of water flowing in each pipe is proportional to the square of its diameter.
Options- A. 26 min
- B. 32 min
- C. 36 min
- D. 42 min Discuss
- 4. Two pipes A and B can separately fill a cistern in 60 min and 75 min 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 min. In how much time, the third pipe alone can empty the cistern ?
Options- A. 85 min
- B. 95 min
- C. 105 min
- D. 100 min Discuss
- 5. 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 ?
Options- A. 15 min 20 sec.
- B. 16 min 40 sec.
- C. 13 min 10 sec.
- D. 14 min 40 sec. Discuss
- 6. A tank is filled in eight hours by three pipes K, L and M. Pipe K is twice as fast as pipe L, and L is twice as fast as M. How much time will pipe L alone take to fill the tank ?
Options- A. 32 hrs
- B. 24 hrs
- C. 28 hrs
- D. 26 hrs Discuss
- 7. Three pipe P, Q and R can fill a tank in 12 minutes, 18 minutesand 24 minutes respectively. The pipe R is closed 12 minutesbefore the tank is filled. In what time the tank is full?
Options- A. 8 (5/13) hrs
- B. 8 (4/13) hrs
- C. 7 (4/13) hrs
- D. 8 (6/13) hrs Discuss
- 8. Pipes A and B can fill a cistern in 15 hours together. But ifthese pipes operate separately A takes 40 hours less than Bto fill the tank. In how many hours the pipe A will fill thecistern working alone?
Options- A. 60
- B. 20
- C. 40
- D. 15 Discuss
- 9. 18 buckets of water fill a tank when the capacity of each bucket is 8 litres. How many buckets will be needed to fill the same tank, if the capacity of the bucket is 12 litres?
Options- A. 12
- B. 13.5
- C. 24
- D. Data insufficient Discuss
- 10. A water tank is 2/5 th full. Inlet A can fill the tank in 12 minutes while an outlet pipe B can empty it in 6minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?
Options- A. It fills in 4.8 min
- B. It empties in 4.8 min
- C. It fills in 5.6 min
- D. It empties in 5.6 min Discuss
Pipes and Cistern problems
Search Results
Correct Answer: 4/3 bucket
Explanation:
2 pipes open for 2 hours will fill = (2/3) x (2/3) x 3 = 4/3 buckets
Correct Answer: 144 min
Explanation:
Let the slower pipe alone fill the tank in x min.
Then, faster pipe will fill it in x/3 min.
1/x + 3/x = 1/36
Correct Answer: 32 min
Explanation:
Given that the diameters of the three pipes are 2 cm, 3 cm and 4 cm
From the given data,
Amount of water from three pipes is 4 units, 9 units and 16 units.
Let the capacity of cistern be 'p' units.
? p/58 = 16
? p = 928 units.
In 1 minute, quantity to be filled by 3 pipes = 29 units
? Total time required = 928/29 = 32 minutes.
Correct Answer: 100 min
Explanation:
Work done by the third pipe in 1 min = 1/50 - (1/60 + 1/75) = - 1/100.
[-ve sign means emptying]
The third pipe alone can empty the cistern in 100 min.
Correct Answer: 14 min 40 sec.
Explanation:
Part filled in 4 minutes = 4(1/15 + 1/20) = 7/15
Remaining part = 1 - 7/15 = 8/15
Part filled by B in 1 minute = 1/20
1/20 : 8/15 :: 1 : k
k = (8/15 )x 1 x 20 = 10( 2/3) min = 10 min 40 sec.
The tank will be full in (4 min. + 10 min. 40 sec) = 14 min 40 sec.
Correct Answer: 28 hrs
Explanation:
1/K + 1/L + 1/M = 1/8 (Given)
Also given that K = 2L and L = 2M
=> 1/2L + 1/L + 2/L = 1/8
=> (1 + 2 + 4)/2L = 1/8
=> 2L/7 = 8
=> L = 28 hours.
Correct Answer: 8 (4/13) hrs
Correct Answer: 20
Explanation:
Let A takes x hours, then B = (x+40) hours
1/x + 1/x+40 = 1/15
x = 20
Correct Answer: 12
Explanation:
Capacity of tank = (8 X 18) = 144 litres
If the capacity of each bucket = 12 litres
Then, Nunber of buckets needed = 144 / 12 = 12 buckets
Correct Answer: It empties in 4.8 min
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