The journey from a rangers' home to the town is 6 km. Mr. ranger started from his home and went 3 km per hour. His women came from the town and also went 3 km per hour. With ranger started dog and runs in 12 km in 1 hour. The dog went to the ranger's woman, then back to the ranger, and ran from one to the one until the two met. How many miles will pass a dog?
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