After being deserted by his crew on an island in the Caribbean, Captain Jack Sparrow builds a raft to escape and set out to sea on it. The wind seems quite steady, at first blowing him due east for 19 km and then 11 km in a direction 5 degrees north of east. Confident that he will eventually reach safety, he falls asleep. When he wakes up, he notices the wind is now blowing him gently 11 degrees south of east, and after traveling for 29 km in that direction, he finds himself back on the island! How far, as the crow flies, did the wind blow him while he was sleeping
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