Commonwealth Bank of Australia Aptitude Test (Interview) Questions - 1

Question: 1

Two pipes, A and B, can separately fill a tank in 6 hours and 8 hours, respectively. Both the pipes are opened together, but $$1{1}/{2}$$ hours later pipe A is turned off. How much time will it take to fill the tank?

(A) $$4{1}/{2}$$ hours

(B) $$5{1}/{2}$$ hours

(C) 5 hours

(D) 6 hours

Question: 2

A tap can empty a tank in one hour. A second tap can empty it in 30 minutes. If both the taps operate simultaneously, how much time is needed to empty the tank?

(A) 10 minutes

(B) 20 minutes

(C) 30 minutes

(D) 40 minutes

Question: 3

A tank can be filled by pipe A in 2 hours and pipe B in 6 hours. At 10 am pipe A was opened. At what time will the tank be filled if pipe B is opened at 11 am?

(A) 5 pm

(B) 12 pm

(C) 12.45 am

(D) 11.45 am

Question: 4

A pipe can empty a cistern in 12 hours. Find the part of the cistern emptied in 4 hours.

(A) $${1}/{2}$$

(B) $${1}/{3}$$

(C) $${1}/{4}$$

(D) $${1}/{6}$$

Question: 5

A cistern has two pipes. One can fill it with water in 8 hours and the other can empty it in 5 hours. In how many hours will the cistern be emptied if both the pipes are opened together when $${3}/{4}$$ of the cistern is already full of water?

(A) $${1}/{3}$$ hours

(B) 6 hours

(C) 10 hours

(D) $$13{1}/{3}$$ hours