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Nina is training for a marathon. She can run 4 1/2 kilometers in 1/3 of an hour. At this pace, how many kilometers can Nina run in 1 hour?

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3 * 4 1/2 = 3 * 9/2 = 27/2 = 13 1/2

well, 1 = 3 * 1/3, so 3 * 4 1/2 = 13 1/2 km

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