Huntsman and dog

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Lilly

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Fred

„But how does that help us?“
„ Well, at the time the dog arrives at the hunting lodge for the first time, the huntsman has only covered half of the total distance. Which distance has the dog covered as the same time? Make up your mind!“
„Lilly, I think the dog has covered a distance ...“
a)...twice as long
b)...four times longer
c)...six times longer
„ ... as the distance the huntsman has covered.“