The traveling that requires shortening Salah

Q: We work at a military base, and live in the city of Riyadh. Our work place is a hundred and sixty (160) kilometers away from home, we head to it daily, our work hours end right after Zhuhr Prayer, where we offer Zhuhr inside the base, then return to Riyadh where we arrive at our houses a while before ‘Asr prayer, our question is:1- Is it permissible for us to shorten the Salah (Prayer) inside the Masjid (mosque) of the base in the mentioned case?2- Is it permissible to combine Zhuhr and ‘Asr Prayers, as we (Part No. 6; Page No. 397) return to our houses very tired to the extent that makes us sleep until the due time of ‘Asr has expired?3-If combining Salah is permissible for us, is it permissible if we return to our houses before ‘Asr prayer and sleep resulting in missing the prayer at the Masjid?

A: Since the mentioned distance exceeds the distance at which shortening Salah is permissible, and you do not plan to stay at your workplace except for the daily work hours, it is permissible for you to use the travel concessions such as combining and shortening Salah. Accordingly, it is permissible for you to combine and shorten Zhuhr and ‘Asr Prayers at the mentioned workplace. However, if you reach Riyadh where you reside and find that people have not offered ‘Asr Prayer yet at the Masjid, it is not obligatory for you to repeat it again.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.