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Basic Arithmetic

Two pipes A and B can separately fill a cistern in 10 and 15 minutes respectively. A person opens both the pipes together when the cistern should have been was full he finds the waste pipe open. He then closes the waste pipe and in another 4 minutes the cistern was full. In what time can the waste pipe empty the cistern when fill?

March 28, 2020 – by Arif Khan 0

A. 7 min
B. 8 min
C. 9 min
D. 10 min

An outlet pipe can empty 2/3 rd of a cistern in 12 minutes. In 8 minutes, what part of the cistern will be emptied?

March 28, 2020 – by Arif Khan 0

A. 4/9
B. 2/3
C. 4/7
D. 1/6

Two pipes can separately fill a tank in 20 and 30 hours respectively. Both the pipes are opened to fill the tank but when the tank is full, a leak develops in the tank through which one-third of water supplied by both the pipes goes out. What is the total time taken to fill the tank?

March 28, 2020 – by Arif Khan 0

A. 18 hrs
B. 16 hrs
C. 15 hrs
D. 12 hrs

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?

March 28, 2020 – by Arif Khan 0

A. 3 1/4 min
B. 5 1/4 min
C. 8 1/4 min
D. 9 1/4 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 minute. If all the pipes are opened, the tank can be filled in 15 minutes. What is the capacity of the tank?

March 28, 2020 – by Arif Khan 0

A. 480 liters
B. 540 liters
C. 600 liters
D. 675 liters

A leak in the bottom of a tank can empty the full tank in 6 hours. An inlet pipe fills water at the rate of 4 liters per minute. When the tank is full in inlet is opened and due to the leak the tank is empties in 8 hours. The capacity of the tank is?

March 28, 2020 – by Arif Khan 0

A. 5260 liters
B. 5760 liters
C. 5846 liters
D. 6970 liters

pipes P and Q would fill a cistern 18 and 24 minutes respectively. Both pipes being opened, find when the first pipe must be turned off so that the cistern may be just filled in 12 minutes?

March 28, 2020 – by Arif Khan 0

A. after 12 mins
B. after 9 mins
C. after 8 1/2 mins
D. after 10 mins

A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in?

March 28, 2020 – by Arif Khan 0

A. 16 hrs
B. 20 hrs
C. 40 hrs
D. 25 hrs

Two pipes A and B can fill a tank in 4 and 5 hours respectively. If they are turned up alternately for one hour each, the time taken to fill the tank is?

March 28, 2020 – by Arif Khan 0

A. 2 hrs 15 min
B. 4 hrs 24 min
C. 5 hrs
D. 3 hrs

Two taps can separately fill a cistern 10 minutes and 15 minutes respectively and when the waste pipe is open, they can together fill it in 18 minutes. The waste pipe can empty the full cistern in?

March 28, 2020 – by Arif Khan 0

A. 7 min
B. 13 min
C. 23 min
D. 9 min

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