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