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\frac{400}{\sqrt{2}\times 10}
Express \frac{\frac{400}{\sqrt{2}}}{10} as a single fraction.
\frac{400\sqrt{2}}{\left(\sqrt{2}\right)^{2}\times 10}
Rationalize the denominator of \frac{400}{\sqrt{2}\times 10} by multiplying numerator and denominator by \sqrt{2}.
\frac{400\sqrt{2}}{2\times 10}
The square of \sqrt{2} is 2.
20\sqrt{2}
Cancel out 2\times 10 in both numerator and denominator.