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The correct answer is $\frac{1}{5}$. Since the number $5$ can also be written as $\frac{5}{1}$, the given equation can also be written as $\frac{x}{8}=\frac{5}{1}$. This equation is equivalent to $\frac{8}{x}=\frac{1}{5}$. Therefore, the value of $\frac{8}{x}$ is $\frac{1}{5}$. Note that 1/5 and .2 are examples of ways to enter a correct answer.

Alternate approach: Multiplying both sides of the equation $\frac{x}{8}=5$ by $8$ yields $x=40$. Substituting $40$ for $x$ into the expression $\frac{8}{x}$ yields $\frac{8}{40}$, or $\frac{1}{5}$.