K7 1 Shangrao to Taoyuan at the same station and transfer to k74 Taoyuan to Zhangjiajie West. Is 3 minutes enough?

That's enough. According to Hao86.com's query, it takes 3 minutes to transfer from k7 1 Shangrao to k74 Taoyuan to Zhangjiajie West Station, but K7 1 and K74 are actually the same train, which means that the train from Shanghai South Railway Station to Yingtan Station is K7 1, and the train to Changsha Station becomes K74.