নল ও চৌবাচ্চা (Pipes and Cistern)

Question 1: 3 pums, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?

Source: উত্তরা ব্যাংক - অ্যাসিস্ট্যান্ট অফিসার - 23-07-2022

Answer: 12

Explanation:

Question 2: A tap can fill a tank in 6 hours. After half the tank is filled , three more similar taps are opened . What is the total time taken to fill the tank completely?

3 hrs 15 min

3 hrs 45 min

4 hrs 15 min

None of these

Source: এক্সিকিউটিভ অফিসার (সাধারণ) ১৮.১০.২০১৯

Answer: 3 hrs 45 min

Explanation:

Question 3: 2 large and 1 small pumps can fill a water tank in 4 hours. 1 large and 3 small pumps can also fill the same water tank in 4 hours . How many hours will it take for 3 large 4 small pumps to fill the tank?

2 hours

2.5 hours

3 hours

3.5 hours

Source: Trust Bank Ltd - Assistant Officer - 30.03.2012

Answer: 2 hours

Explanation:

Question 4: Two tanks are filled to capacity with automobile fuel. The first tank holds 600 gallons more than the second tank. If 100 gallons were to be pumped from each tank, the first tank would then contain 3 times as much fuel as the second tank. What is the total number of gallons of fuel in the two full tanks?

1400

1200

1000

900

Source: Dhaka Bank Ltd - MTO - 2003

Answer: 1400

Explanation:

Question 5: একটি নল দ্বারা ১২ মিনিটে একটি চৌবাচ্চা পূর্ণ হয়। অপর একটি নল দ্বারা ১ মিনিটে তা থেকে ১৫ লি. পানি বের হয়। চৌবাচ্চাটি খালি অবস্থায় ২ টি নল একসঙ্গে খুলে দিলে ৪৮ মিনিটে পূর্ণ হয়। চৌবাচ্চাটিতে কত লিটার পানি ধরে?

220

240

225

272

Source: বেসামরিক বিমান চলাচল কর্তৃপক্ষ - সিনিয়র অফিসার (22-10-2021)

Answer: 240

Explanation:

Question 6: A pump can fill with water in 2 hours. Because of a leak, it took 213 hours to fill the bank . The leak can drain all water of the tank in:

413hrs.

7 hrs.

8 hrs

14 hrs.

Source: Rupali Bank Ltd - Officer - 04.10.2013

Answer: 14 hrs.

Explanation:

Question 7: Two taps A and B can fill a tank in 5 hours and 20 hours respectively. If both the taps are open then due to a leakage, it took 30 minutes more to fill the tank. If the tank is full, how long will it take for the leakage alone to empty the tank ?

4.5 hrs

7 hrs

18 hrs

36 hrs

Source: Janata Bank Ltd - Executive Officer (Af) - 24.03.2017

Answer: 36 hrs

Explanation:

Question 8: Three pipes can independently fill a water tank in 10,12 and 15 hours. How many hours will it take for all three pipes opened together to fill half of the tank?

Source: Agrani bank Ltd - Senior Officer - 12.02.2010

Answer: 2

Explanation:

Question 9: A tank is fitted with 8 pipes, some of them that fill the tank and others that are waste pipe meant to those that empty the tank can empty it in 6 hours. If all the pipes are kept open when the tank is full, it will take exactly 6 hours for the tank to empty. How many of these are these are fill pipes?

Source: Mutual Trust Bank ltd - Management Trainee Officer - 16.05.2014

Answer: 4

Explanation:

Question 10: একটি চৌবাচ্চা তিনটি নল দিয়ে যথাক্রমে ১০, ১২ ও ১৫ ঘন্টায় পূর্ণ হতে পারে। তিনটি নল একসঙ্গে খুলে দিলে চৌবাচ্চার অর্ধেক পূর্ণ হতে কত সময় লাগবে?

৪ ঘন্টা

৬ ঘন্টা

৩ ঘন্টা

২ ঘন্টা

Source: প্রাথমিক বিদ্যালয় প্রধান শিক্ষক নিয়োগ -2009-(জবা-03) (11-09-2009)

Answer: ২ ঘন্টা

Explanation:

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Two taps A and B can fill a tank in 5 hours and 20 hours respectively. If both the taps are open then due to a leakage, it took 30 minutes more to fill the tank. If the tank is full, how long will it take for the leakage alone to empty the tank ?

সুমন ২০ টাকা ও ৩০ টাকা দামের সমসংখ্যক কলম কিনলো ্ যদি সে মোট ১০০০ টাকা কলম কিনে থাকে তবে মোট কয়টি কলম কিনলো?

A tank is 25 m long, 12 m wide and 6 m deep. The cost of plastering its walls and bottom at 75 paisa per m2 is -

দুটি নল দ্বারা একটি চৌবাচ্চা ৬ মিনিটে পূর্ণ হয়। নল দুটি একসঙ্গে খুলে দেয়ার ৩ মিনিট পরে একটি নল বন্ধ করে দেয়াতে চৌবাচ্চাটি পূর্ণ হতে আরো ৫ মিনিট সময় লাগবলো। প্রত্যেকটি নল দ্বারা পৃথকভাবে চৌবাচ্চাটি পূর্ণ হতে কত সময় লাগবে?

Three -fourth petrol of a reservoir is used to fill the petrol tanks of five trucks having the same storage capacity, what part of the total capacity of the petrol reservoir did each truck receive?

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 6 hours. The number of hours taken by C alone to fill the tank is:

Two tanks A and B are filled with petrol. Tank A holds 600 liters more than B. If 100 liters of petrol were taken out from each tank, tank A would then contain 3 times as much petrol as tank B. What is the total number of liters of fuel in the two full tanks?

A tank is filled in 5 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?

2 large and 1 small pumps can fill a water tank in 4 hours. One large and 3 small pumps can also fill the same water tank in 4 hours. how many hours will it take for 3 large and 4 small pumps to fill the tank?

A pipe of 2 inch diameter fills a water tank in one hour . If the diameter of the pipe is 4 inch in what time will the pipe fill the same tank?

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Question 1: 3 pums, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?

Question 2: A tap can fill a tank in 6 hours. After half the tank is filled , three more similar taps are opened . What is the total time taken to fill the tank completely?

Question 3: 2 large and 1 small pumps can fill a water tank in 4 hours. 1 large and 3 small pumps can also fill the same water tank in 4 hours . How many hours will it take for 3 large 4 small pumps to fill the tank?

Question 6: A pump can fill with water in 2 hours. Because of a leak, it took 213 hours to fill the bank . The leak can drain all water of the tank in:

Question 7: Two taps A and B can fill a tank in 5 hours and 20 hours respectively. If both the taps are open then due to a leakage, it took 30 minutes more to fill the tank. If the tank is full, how long will it take for the leakage alone to empty the tank ?

Question 8: Three pipes can independently fill a water tank in 10,12 and 15 hours. How many hours will it take for all three pipes opened together to fill half of the tank?

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