He started journey at 18:40 and finished at22:20 time taken in completing the journey is
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Starting point of journey = 18:40
End point of journey = 22:20
Time from 18:40 to 19:00 = 20 minutes
Time from 19:00 to 22:00 = 22-19 = 3 hours
Time from 22:00 to 22:20 = 20 minutes
total time = 20 min + 3 hour + 20 min = 3h 40 min
End point of journey = 22:20
Time from 18:40 to 19:00 = 20 minutes
Time from 19:00 to 22:00 = 22-19 = 3 hours
Time from 22:00 to 22:20 = 20 minutes
total time = 20 min + 3 hour + 20 min = 3h 40 min
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