פירוש על שמות 12:37

מרעמסס סכתה FROM RAMESES TO SUCCOTH — These were distant from one another 120 miles and yet they reached there in one moment, as it is said, (Exodus 19:4) “and I carried you as on eagles’ wings” (cf. Mekhilta d'Rabbi Yishmael 12:35 and Rashi on Exodus 19:4).

[The distance between them was] 120 mil. [Rashi knows this] because Scripture did not need to write, “From Ramseis,” since we already know that they were in Ramseis, as it is written in Parshas Vayigash (Bereishis 47:11). Thus, “From Ramseis” is mentioned only to tell us that they traveled a distance of 120 mil in a moment.