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 \[=\,\,\frac{600}{50}=12\,\,\min .\] |
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