On time vs. in time

[antonio]

Test No. express/inter-10 "Under my Skin", question 2

As they only had a few minutes to get to the station, they ran all the way and finally caught the train by the skin of their teeth.

(a) just in time
(b) just for time
(c) just on time
(d) just by time

Test No. express/inter-10 "Under my Skin", answer 2

As they only had a few minutes to get to the station, they ran all the way and finally caught the train just in time.

Correct answer: (a) just in time
_________________________

difference between "just in time"
and "just on time"?

[Torsten]

On time means at the agreed point of time:
Mr Miller arrived at the office on time for our meeting.

In time means to almost be late, but manage to get there:
Although the traffic had been very bad I managed to get to the office in time.

TOEIC listening, talks: Announcing special employee discounts on leisure services