A) 50 min
B) 12 min
C) 25 min
D) 15 min
Correct Answer: B
Solution :
\[\therefore \]Required time\[=\frac{1}{\frac{1}{20}+\frac{1}{30}}\] \[=\frac{20\times 30}{50}=12\,\,\min \]You need to login to perform this action.
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