السلام عليكم ورحمة الله وبركاته أحسن الله إليكم ، Can one pray qasr and combine the salah with other people ? Or does he have to pray alone and do it.

Ustadh AbdulAziz al-Haqqan

If you are travelling and you pray behind an imam who is not travelling then u pray as he prays 4 rakas.