б) \(\frac{11}{12}\) : \(\frac{7}{24}\) : \(\frac{21}{22}\);

б) \(\frac{11}{12}\) : \(\frac{7}{24}\) : \(\frac{21}{22}\) = \(\frac{11}{12}\) * \(\frac{24}{7}\) * \(\frac{22}{21}\) = \(\frac{11*24*22}{12*7*21}\) = \(\frac{5808}{1764}\) = \(\frac{484}{147}\) = 3\(\frac{43}{147}\)

Ответ: 3\(\frac{43}{147}\)