Question
Rachel and Xuan started walking at 4.30 a.m. Rachel walked for 20 min while Xuan walked four times as long as Rachel. At what time did Xuan finish her walk?
4 m

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Rachel and Xuan started walking at 4.30 a.m. Rachel walked for 20 min while Xuan walked four times as long as Rachel. At what time did Xuan finish her walk?