Aptitude - Area - Discussion

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Q.

Two pipes A and B can fill a tank in 36 min. and 45 min. respectively. A water pipe C can empty the tank in 30 min. First A and B are opened. After 7 minutes, C is also opened. In how much time, the tank is full?  .                          
A. 36 min B. 46 min
C. 56 min D. 66 min

Answer: Option B
Explaination:

 


Discussion

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