transport for 30 people from Xian airport and back

We have total of 30 students with luggages will arrive the Airport on Dec 31, 2014 at 23:15pm. by the time check out of airport will be 12:00am mid night.

We will go to Ancient City Youth Hostel at no. 4, Lian Hu Road close to Bei Da Jie Street .

How much will be the fare for each taxi ? how far away ?

What is the transportation recommanded for this late arriving time ? How much if we chater a 40 seats bus ? any bus company we can contact ?

Appreciate your advice, thanks.