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A train and a car start at the same time, parallel to each other in the same direction. The car starts its journey from the rear end of the train. The car reaches the front end of the train and comes back to the back end of the train. In the meantime, the mail train travels a distance of 1 km. If the speed and the length of the mail train is 1 km/h and 1 km respectively then what is the distance covered by the car?