Prayer: If the outward trip is under 4 farsakhs but return is 6, should one shorten prayer and break fast?

Practical Laws of Islam as per the teachings of Imam Khamenei

Prayer: If the outward trip is under 4 farsakhs but return is 6, should one shorten prayer and break fast?

English:

Question #660:

According to the Imam one should pray shortened and break the fast when travels a distance of eight shar‘ī farsakhs. If the going distance is less than four shar‘ī farsakhs but for returning one is forced to cover a distance of six shar‘ī farsakhs (due to unavailability of a car or difficulties of the road), should one shorten the prayer and break the fast?

Answer #660:

If the going distance is less than four farsakhs and the return way alone is not equal to the shar‘ī distance, he should say full prayer and fast.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Prayer