60. In what ratio does a plane, parallel to two skew edges of a triangular pyramid and dividing one of the other edges in the ratio $2: 1$, divide the volume of the pyramid?
60. Let the lengths of these intersecting edges be denoted by $a$ and $b$, the distance between them by $d$, and the angle by $\varphi$. Using the formula from problem 15, we find the volumes of the resulting parts:

$$
V_{1}=\frac{10}{81} a b d \sin \varphi, \quad V_{2}=\frac{7}{162} a b d \sin \varphi
$$

Answer: $\frac{20}{7}$.