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# Train Station

Every day, Joe arrives at the train station from work at `6pm`.
His wife leaves home in her car and meets him there at exactly `6pm`, and drives him home. One day, Joe gets to the station `an hour early`, and starts walking home, until his wife meets him on the road. They get home `20 minutes` earlier than usual.
How long was he walking?
Distances are unspecified. Speeds are unspecified, but constant.
Output a number which represents the answer in minutes.

• Case 1 : Answer is a integer. Just put the number without any decimal places if its an integer. If the answer is Infinity, output Infinity.
• Case 2 : Floating point number. Round it off to 2 decimal places and output it as I.xx where I is the integer part of the answer, and xx are 2 decimal digits after rounding off.

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