In Ms. Gal. 72 Galileo made use of two relations between velocities, distances and times which were common in the Aristotilian tradition. He later integrated these relations as propositions into the deductive theorie of motion presented in De motu locali. One of these is there formulated as 1/03-th-03:

In the case of unequal speeds, the time-intervals required to traverse a given space are to each other inversely as the speeds. (See also Aristotle, Physics, 232a23-232b15.)