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 31 miles per hour. the second ferry, the bird, travels at 21 miles per hour.

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 31 miles per hour. the second ferry, the bird, travels at 21 miles per hour. in how many hours will the two ferries be 20 miles apart?

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