Banking Quantitative Aptitude Sample Paper Quantitative Aptitude Sample Paper-3

Two pipes A and B can independently fill a tank completely in 20 and 30 min respectively. If both the pipes are opened simultaneously, how much time will they take to nil the tank completely?

A) 10 min

B) 12 min

C) 15 min

D) 25 min

Correct Answer: B

Solution :

[b] Pipe A can filled the tank in 1 min \[=\,\frac{1}{20}part\]

Pipe B can filled the tank in 1 min \[=\,\,\frac{1}{30}part\]

If both pipes are open, then

Tank can be filled in 1 min

\[=\frac{1}{30}+\frac{1}{20}=\frac{20+30}{600}=\frac{50}{600}part\]

So, tank can be fully filled in \[=\,\,\frac{600}{50}=12\,\,\min .\]