Life is fully packed

A girl leaves for her tuitions at 5:30pm, catches the 6pm train, which arrives at the station in her home town at 6:30pm. Her brother leaves home each day, drives to the station and picks her up at 6:30pm, just as she gets off the train. Today the woman finishes her tuitions 10 min early and manages to catch the train at 5:30pm, which arrives at her home station at 6pm. Since her brother is not there to pick her up she begins to walk home. Her brother leaves home at the usual time, sees his sister walking, turns around, picks her up and drives home, arriving there 10 minutes earlier than usual. Assume that the trains arrive precisely on time. For how long does the girl walk before her brother picks her up? (Answer in number of minutes)

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