China Southern Airlines passengers can get detailed information about their flights such as arrival time departure gates and the local weather on their phones . They only have to scan the bar codes on their boarding passes.31 . How long does it take for passengers to check their tickets by themselves at Guangzhou South Railway Station ?

Services at airports have also been improved with smart  technology . China Southern Airlines passengers can get  detailed information about their flights such as arrival  time departure gates and the local weather on their  phones . They only have to scan the bar codes on their  boarding passes.

31 . How long does it take for passengers to check their  tickets by themselves at Guangzhou South Railway Station ?

A. About 5 seconds

B. About 16 seconds

C. About 40 seconds

D. About a minute

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