A flask is filled with equal moles of A and B. The half lives of \( \mathrm{A} \) and \( \mathrm...

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A flask is filled with equal moles of A and B. The half lives of \( \mathrm{A} \) and \( \mathrm{B} \) are \( 100 \mathrm{~s} \) and 50 s respectively and are independent of the initial concentration. The time required for the concentration of \( A \) to be four times that of \( B \) is seconds.
(Given: In \( 2=0.693 \) )
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