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$t = 2.52 billion \:years$

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As we know by radioactivity law

$N = N_o e^{-\lambda t}$

so here we will have

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now we will have

$3 = 12 e^{-\lambda t}$

$\lambda t = ln 4$

now we also know that

$\lambda = \frac{ln2}{1.26 \times 10^6 yrs}$

$t = 1.26\times 10^6\times \frac{ln4}{ln2}$

$t = 2.52 billion \:years$

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