Aptitude - Arithmetical Ability

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37.

Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?                        
A. 12 min B. 15 min
C. 25 min D. 50 min



38.

Two pipes A and B can fill a tank in 12 minutes and 16 minutes respectively. If both the pipes open together after how much time should be B closed so, that the tank is full in 9 minutes?                        
A. 5 Hours B. 4 Hours
C. 6Hours D. 8 Hours



39.

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 litres a minute. When the tank is full, the inlet is opened and due to the leak the tank is empty in 8 hours. The capacity of the tank (in litres) is                        
A. 5260 B. 5846
C. 5760 D. 6970




40.

Two pipes A and B can fill a tank in 10 hours and 12 hours respectively. B is open for 2 hours in the beginning, and then B is closed. In how much time A fill the remaining tank?                        
A. 2(1/3) Hours B. 4(1/3) Hours
C. 6(1/3) Hours D. 8(1/3) Hours



41.

TapsA and B can fiJi a bucket in 12 minutes and 15 minutes respectively. If both are opened and A is closed after 3 minutes, how much further time would it take for B to fill the bucket                        
A. 7 nun. 45 sec B. 8 mm. 5 sec
C. 7 mm. 15 sec D. 8 mm. 15 sec



42.

Two pipes A and B can fill a tank in 15 minutes and 20 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. 20 sec. B. 11 min. 45 sec.
C. 12 min. 30 sec. D. 14 min. 40 sec.



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