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You have to bring 4 horses from their old stable to a new one. At any given time, you can move only 2 horses by riding 1 and taking the other by the lead. Since they are all of different age, they move at vastly different speeds. The 1st horse can bridge the distance in 1 hour, the 2nd in 2 hours, the 3rd in four and the fourth in 6. How many hours does it take to move all the horses?
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Interesting fact:
Male and female horses have a different number of teeth, 40 and 36 respectively. Horses are the land mammals with the largest eyes. Contrary to popular believe, they aren’t colour-blind. They don’t see all colours equally good: They have no trouble distinguishing between greens and yellows, while blues and violets will give them a hard time.