к) $$4\frac{2}{7}:1\frac{2}{5} = \frac{30}{7} : \frac{7}{5} = \frac{30}{7} \cdot \frac{5}{7} = \frac{150}{49} = 3\frac{3}{49}$$
Ответ: $$3\frac{3}{49}$$