Question: Two high-speed ferries leave at the same time from a city to go to the same island. The first ferry, the Cat, travels at 39

Two high-speed ferries leave at the same time from a city to go to the same island. The first ferry, the Cat, travels at 39 miles per hour. The second ferry, the Bird, travels at 21 miles per hour. In how many hours will the two ferries be 90 miles apart? The ferries will be 90 miles apart after hour(s)

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