Find the travel time: depart 12: 20 pm cst arrive 3: 05 pm est.

The travel time that is obtained with the help of given arrival and departure time is:

                   1 hours and 45 minutes.

The departure time is:

                      12:20 pm  cst

and the arrival time  is:

                3:05 pm est.

We know that 12:20 pm cst(Central standard time) = 1:20 pm est( Eastern standard time )

The travel time is the time that is spend in travelling i.e. it is the time spend in travelling between the trip of two cities.

Hence, the travel time is:

     3:05 pm-1:20 pm

=   1 hours and 45 minutes.

2nd one in the first row is correct