Please explain that if Chicago time is one hour earlier than New York time, then when it is 6:00 Pm in Chicago , why it is 7:00PM in New york ?

Should it be 5:00 Pm in New york?
--------------------------------------------------------------------------------------------------------------------------------------------

A train travels from New York to Chicago, a distance of approximately 840 miles, at an average rate of 60 miles per hour and arrives in Chicago at 6:00 in evening, Chicago time. At what hour in the morning, New York time, did the train depart for Chicago? ( Note : Chicago time is one hour earlier than New York time)

A) 3:00
B) 4:00
C) 5:00
D) 6:00
E) 7:00