In a road a boy,a girl and a dog started walking. They start at the same time, from the same point, in the same direction. The boy walks at 5 km/h, the girl at 6 km/h. The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn. How far does the dog travel in 1 hour?
10km. Because the dog's speed is 10 km/h.
Where the boy and girl are has no effect on answering this puzzle.
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