What are the magnitude and the direction of rider velocity, Physics

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A park ride is designed so that the rider is on the edge of a revolving platform, 3.5 m from the platform's center. This platform is mounted 8.0 m from the center of a larger revolving platform. The smaller platform makes one revolution in 6.0 s and completes 2.0 rev for each revolution of the larger platform. All rotations are counter clockwise. At the immediate shown, what are the magnitude and the direction of the rider's velocity with respect to the ground?

 

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