For $2\mathrm{A}\to \mathrm{P}$ with $-d[\mathrm{A}]/dt=k[\mathrm{A}{]}^2$, $k=0.020\mathrm{L}\mathrm{mo}{\mathrm{l}}^{-1}{\mathrm{s}}^{-1}$ and $[\mathrm{A}{]}_0=0.50\mathrm{mol}{\mathrm{L}}^{-1}$. The time needed for 75% of $\mathrm{A}$ to react is

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