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Two children who are bored while waiting for their flight at the airport decide to race from one end of the 20 -long moving sidewalk to the other and back. Phillippe runs on the sidewalk at 2.0 (relative to the sidewalk). Renee runs on the floor at 2.0 . The sidewalk moves at 1.5 relative to the floor. Both make the turn instantly with no loss of speed.

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