Can you solve the Tricky Logical Puzzle || The Clever Commuter

Every day, jack takes the train to travel from his office back to his place of residence called green valley.
Usually, he arrives at the station of green valley at six o'clock, and exactly at that moment, his wife picks him up by car.
Yesterday evening, Jack took an earlier train, without informing his wife, and therefore he already was at the station of green valley
at five o'clock.
He decided to walk part of the way to meet his wife.
After some duration he met the car with his wife and they drove home in car.
In this whole journey, they reached home ten minutes earlier than their normal time.
If, Jack's wife always drives the entire way between home and station at the same constant speed.
PUZZLE:
How long did Jack walk yesterday evening?
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