\[ \frac{5}{8} - \frac{1}{4} = \frac{5}{8} - \frac{2}{8} = \frac{3}{8} \]
\[ \frac{5}{4} : \frac{3}{8} = \frac{5}{4} \times \frac{8}{3} = \frac{5 \times 8}{4 \times 3} = \frac{40}{12} \]
\[ \frac{40}{12} = \frac{10}{3} \]
Ответ: $$\frac{10}{3}$$