t = \frac{1, 8 \cdot 10^{5} C}{2 \cdot 10^{2} A} = 9 \cdot 10^{2} s = 900 s

${t = \frac{1,8 \cdot 10^5 \text C}{2 \cdot 10^2 \text A} = 9 \cdot 10^2 \text s = 900 \text s}$

Error