Two substances \( \mathrm{A} \) and \( \mathrm{B} \) are present such that \( [\mathrm{A}]_{0}= ...

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Two substances \( \mathrm{A} \) and \( \mathrm{B} \) are present such that \( [\mathrm{A}]_{0}= \) \( 4\left[\mathrm{~B}_{0}\right] \) and half-life of \( \mathrm{A} \) is \( 5 \mathrm{~min} \) and that of \( \mathrm{B} \) is math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymn15/mnmo /momimin/mi/math. If they start decaying at the same time following first order kinetics, how much time later will the concentration of both of them would be same?
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