Answer
Please see the work below.
Work Step by Step
We know that
$\frac{1}{[A]}=\frac{1}{[A]_0}+Kt$
We plug in the known values to obtain:
$\frac{1}{0.28}=\frac{1}{0.62}+0.54t$
This simplifies to
$t=3.6s$
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