Answer
$3.24\times 10^5\;\rm C$
Work Step by Step
We know that the current is given by
$$I=\dfrac{Q}{t}$$
So the charge amount is given by
$$Q=It$$
Plug the known;
$$Q=(90)(3600)$$
$$Q=\color{red}{\bf 3.24\times 10^5}\;\rm C$$
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