Merry-Go-Round

A merry-go-round has a radius of about 8 m8 \text{ m}. A child sitting on a horse on the outer edge sees his parents, standing still at the entrance, every 20 s20 \text{ s}. If the child's horse could break free of its merry-go-round restraints and continue forward tangentially without accelerating, how fast would it be traveling in m/s\text{m}/\text{s}?

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