Problem

Sam is driving down the road at 30m/s. Toni, who is in front of Sam, is driving 25m/s in the same direction. Toni, watching in her rear-view mirror, sees Sam reach out the window and throw a ball towards her. If Sam sees the ball moving away from him at 10m/s, does Toni see the ball moving towards her, or away from her? How fast is the ball moving according to Toni?

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