48.3.1.5

48. $$ \frac{3}{8} : \frac{1}{9} \cdot \frac{5}{16} = \frac{3}{8} \cdot 9 \cdot \frac{5}{16} = \frac{3 \cdot 9 \cdot 5}{8 \cdot 1 \cdot 16} = \frac{135}{128} = 1\frac{7}{128}$$

Ответ: $$1\frac{7}{128}$$