Решение:
\[ \frac{11}{12} : \frac{7}{24} = \frac{11}{12} \times \frac{24}{7} \]
\[ \frac{11}{12} \times \frac{24}{7} = \frac{11}{7} \times \frac{2}{1} = \frac{22}{7} \]
\[ \frac{22}{7} \times \frac{21}{22} \]
\[ \frac{22}{7} \times \frac{21}{22} = \frac{1}{1} \times \frac{3}{1} = 3 \]
Ответ: 3