Pipe A fills a tank in 30 minutes Pipe B can fill the same tank 5 times as fast as pipe A If both th...........

Quantitative Aptitude ( CCS) Pipes&cistern

Pipe A fills a tank in 30 minutes. Pipe B can fill the same tank 5 times as fast as pipe A. If both the pipes were kept open when the tank is empty, how much time will it take for the tank to overflow?

3 minutes

2 minutes

5 minutes

4 minutes

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Explanation:

Answer & Explanation
Answer – C. 5 minutes
Explanation :
Total Capacity = 90L.
Tank filled in 1 minute by A = 3L
Tank filled in 1 minute by B = 15L
The capacity of the tank filled with both A and B in 1 minute = 18L.
overflow = 90/18 = 5 minutes.