A) 6 hours
B) 12 hours
C) 24 hours
D) 128 hours
Correct Answer: B
Solution :
\[N=\frac{{{N}_{o}}}{64}=\frac{{{N}_{o}}}{{{2}^{6}}}\] \[\therefore n=6\] Thus total time \[=2\times 6=12hr\].
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