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\frac{\mathrm{dh}}{\mathrm{dt}}=\frac{\mathrm{dV} / \mathrm{dt}}{\left(4.10 \mathrm{~m}^{2}\right)}=\frac{5 \mathrm{~m}^{3} / \mathrm{s}}{4.10 \mathrm{~m}^{2}} \approx 1.22 \mathrm{~m} / \mathrm{s}